Article
Materials Science, Multidisciplinary
Mohammad Reza Khosravani, Peter Frohn-Soerensen, Bernd Engel, Tamara Reinicke
Summary: This research investigates the fracture behavior and crack propagation of cracked plates in 3D printing. Different fracture modes were obtained by changing the angle between the crack and the applied load. The study uses stereolithography (SLA) technique to fabricate specimens and finite element method and digital image correlation technique to determine stress intensity factors and strain field.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
PeiYao Li, Yu E. Ma, WenBo Sun, Xudong Qian, Weihong Zhang, ZhenHai Wang
Summary: Additive manufacturing technology enables the production of complex lattice structures that are difficult to fabricate using traditional methods. In this study, Ti6Al4V lattice structures manufactured by laser powder bed fusion were investigated. Five different cell topologies were analyzed and compared to understand their mechanical behavior and failure modes. It was found that the FBCCZ topology exhibited the best performance in terms of elastic modulus and compressive strength, while the FCCZ topology had the highest specific compressive strength and specific energy absorption. It was also observed that the failure modes differed among the samples, with shear failure being dominant in most cases except for the diamond sample, which collapsed layer by layer. Finite element analysis was conducted to further understand the damage evolution in these lattice structures.
THIN-WALLED STRUCTURES
(2022)
Article
Materials Science, Composites
Lijun Li, Wenyao Liu, Lingyu Sun
Summary: This paper presents a comprehensive study on the mechanical properties of 3D printed continuous fiber reinforced thermoplastic composites. The results show that the print fiber filament fill pattern and low strain rate have significant effects on the mechanical properties and failure behavior. The mechanical properties of different specimens can be predicted by the rule of mixing, except for notched specimens.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Davoud M. Jafarlou, Bryer C. Sousa, Matthew A. Gleason, Gehn Ferguson, Aaron T. Nardi, Danielle L. Cote, Ian R. Grosse
Summary: The research introduces the cold spray process as a method for additive manufacturing of tantalum and extensively evaluates the material's mechanical properties. While anisotropy in the mechanical properties was observed, the material exhibited high strength and excellent isotropy. The study reveals that the cold spray process is suitable for producing tantalum components.
ADDITIVE MANUFACTURING
(2021)
Article
Mechanics
Sina Ilyaei, Yousef Abubasir, Reza Sourki
Summary: This study investigated the effects of mixed-mode loading conditions on 3D printed porous scaffolds, revealing that design parameters and pore characteristics significantly impact mechanical strength.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Sergey Astafurov, Elena Astafurova, Kseniya Reunova, Evgenii Melnikov, Marina Panchenko, Valentina Moskvina, Galina Maier, Valery Rubtsov, Evgenii Kolubaev
Summary: High nitrogen steel billets were produced using electron-beam additive manufacturing with significant changes in microstructure and composition during solidification. The dual-phase structure and morphology play crucial roles in the performance of high-nitrogen steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
B. Vieille, A. Duchaussoy, S. Benmabrouk, R. Henry, C. Keller
Summary: This study investigates the impact of the original crack orientation on the fracture toughness of LPBF HX materials. The results show that samples with cracks parallel to the lasing plane have the highest fracture toughness values. Compared to cast specimens, the fracture toughness of LPBF specimens is 5-6 times higher.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Multidisciplinary
G. D. Goh, William Toh, Y. L. Yap, T. Y. Ng, W. Y. Yeong
Summary: The mechanical properties of additively manufactured continuous carbon fiber-reinforced thermoplastic were investigated, leading to the design and fabrication of a UAV landing gear with excellent mechanical performance. Experimental data showed that the landing gear structure could withstand extreme conditions during operation.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Mohammad Reza Khosravani, Hadi Sadeghian, Majid R. Ayatollahi, Tamara Reinicke
Summary: Due to the wide scope of applications of additive manufacturing (AM) in making final products, it is crucial to determine the mechanical strength and structural integrity of AM parts. This study focuses on the pin-bearing test to evaluate the stress response of fasteners, plates, and holes. Two polymer materials were used to fabricate samples, and the effects of specimen width and hole diameter on pin-bearing strength were investigated. Tensile tests were performed, and the failure behavior was analyzed using scanning electron microscopy and digital image correlation technique. The results provide insights for designing AM parts with improved mechanical strength.
Article
Engineering, Chemical
Ahmed O. Adisa, Austin R. Colon, David O. Kazmer, Amy M. Peterson
Summary: Additive manufacturing reduces lead time and enables the production of custom-made parts with complex geometry. However, achieving reliability, reproducibility, and isotropic bulk properties remains challenging.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Manufacturing
Benjamin C. Stump, Brian T. Gibson, Jay T. Reynolds, Charles C. Wade, Michael C. Borish, Peter L. Wang
Summary: As powder bed fusion (PBF) additive manufacturing (AM) progresses, system configurations are shifting towards unconventional configurations to increase throughput. The inclusion of multiple heat sources increases the complexity of control schemes and load balancing becomes crucial. This paper introduces high-performing load balancing methods for multi-beam systems of any complexity, enabling on-the-fly load balancing in case of beam failures and improving system robustness.
ADDITIVE MANUFACTURING
(2023)
Article
Mechanics
Scott E. Julien, Ahmad Nourian-Avval, Wentao Liang, Tricia Schwartz, Ozan C. Ozdemir, Sinan Muftu
Summary: This study investigated the tensile and fracture anisotropy in helium-sprayed bulk Al 6061 cold spray deposits. The results showed no in-plane anisotropy in tensile properties, while the fracture toughness exhibited mild transverse isotropy. The low level of anisotropy was attributed to effective spray parameters and the usage of helium gas, ensuring good interparticle bonding.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Maryam Tilton, Alireza Borjali, Aaron Isaacson, Kartik Mangudi Varadarajan, Guha P. Manogharan
Summary: This study presented new findings on structure-property relationships of AM meta-biomaterials based on minimal surfaces, specifically Primitive and IWP topologies. The designed meta-biomaterials exhibited distinct mechanical behaviors and fracture mechanisms under different loading conditions, with the ability to control these properties based on topology and morphology.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Pan Jiangang, Yuan Bo, Ge Jinguo, Ren Yu, Chen Hongjun, Zhang Liang, Lu Hao
Summary: This study investigates the influence of two arc modes, microMIG and microMIG-CC, on the properties of thin-walled aluminum alloy specimens. The microMIG mode leads to smaller grain size and lower porosity, resulting in higher tensile strength. On the other hand, the microMIG-CC mode exhibits higher hardness due to the aggregation of dislocations and the increase of precipitates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Manufacturing
Merve Taftali, Kerem Turalioglu, A. Fatih Yetim, Yakup Uzun, Salih Akpinar, Fatih Yildiz
Summary: This study demonstrates that by increasing the strength of the metal-ceramic interfaces and designing different numbers and locations of protrusions on the surface of metal crowns, the overall strength of porcelain fused to metal dental crowns can be improved. The research found that metal crowns with dense protrusions at a thickness of 0.3 mm showed the highest strength under both static and dynamic loading conditions.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Hamid Reza Safavi, Arya Amiri, Majid Baniassadi, Ali Zolfagharian, Mostafa Baghani
Summary: In this study, an anisotropic constitutive model is proposed for cellulose-reinforced salt-sensitive hydrogels, and its predictive capability is verified through experimental data. The model, implemented numerically using the finite element method, is able to effectively predict the swelling behavior of the hydrogels with different fiber orientations. The results demonstrate that adding cellulose fibers significantly enhances the strength of the material without compromising its inherent flexibility.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Armin Yousefi, Saman Jolaiy, Mohammadreza Lalegani Dezaki, Ali Zolfagharian, Ahmad Serjouei, Mahdi Bodaghi
Summary: This article introduces novel 3D bio-inspired auxetic meta-structures that are printed with soft/hard polymers for energy absorption/dissipation applications. The feasibility and mechanical performance of these structures are assessed experimentally and numerically, demonstrating unique features such as large recoverable deformations, stress softening, and high energy absorption/dissipation capacity. The results are expected to be instrumental in the design of 3D printed devices with tunable soft and hard materials for high energy absorption/dissipation applications.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mohammadreza Lalegani Dezaki, Mahdi Bodaghi, Ahmad Serjouei, Shukri Afazov, Ali Zolfagharian
Summary: This article demonstrates the engineering of soft pneumatic actuators (SPAs) with different behaviors by changing 3D printing parameters and using bio-inspired lattice chambers. The effects of material flow and nozzle temperature parameters on the material properties and stiffness are studied. Lattices, such as auxetic, columns, face-centered cubic, honeycomb, isotruss, oct vertex centroid, and square honeycomb, are designed to investigate the actuators' behaviors under the same input pressure.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Majid R. R. Ayatollahi, Parham Rezaeian, Amir Nabavi-Kivi, Mohammad Reza Khosravani
Summary: This study investigates the effect of heat treatment on the tensile, flexural, and fracture strength of PLA specimens made by the FDM technique. Annealing at different temperatures (80℃, 100℃, 120℃) was conducted on dog bone and ECT specimens to evaluate the mechanical and fracture performance of the FDM-PLA parts. Fracture behavior was assessed using EMC, J-integral, ASED, and MTS criteria, and compared with experimental results. Heat treatment significantly improved the structural integrity of FDM specimens, with a 57% increase in fracture resistance.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Ali Zolfagharian, Mohammad Lakhi, Sadegh Ranjbar, Morteza Sayah Irani, Marwan Nafea, Mahdi Bodaghi
Summary: Four-dimensional (4D) printing adds a time-dependent reconfiguration dimension to three-dimensional (3D) printed products, enabling the creation of dynamically controllable shapes. This study focuses on the rapid design and optimization of 4D-printed bi-stable thermally responsive structures for use in soft robotics. The response surface method (RSM) optimization with numerical solutions was used to analyze key parameters in the design of a bi-stable soft robotic gripper, evaluating the individual and coupling effects of these parameters on output responses.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Mechanics
A. Nabavi-Kivi, M. R. Ayatollahi, S. Schmauder, M. R. Khosravani
Summary: Understanding the mechanical response of polymer components fabricated by fused deposition modeling (FDM) is crucial. This study investigates the effects of raster angle and layer orientation on the tensile properties and fracture toughness of ABS specimens produced by FDM. The results show that different raster angles and layer orientations result in different fracture loads, as observed through analysis of fracture surfaces and examination of fracture paths.
PHYSICAL MESOMECHANICS
(2023)
Article
Instruments & Instrumentation
Ali Zolfagharian, Hamid Reza Jarrah, Matheus S. Xavier, Bernard Rolfe, Mahdi Bodaghi
Summary: SMP-based functional structures can now be efficiently produced using 4D printing, thanks to advances in multi-material 3D printing technologies. The design strategy involves the use of variable thickness ratios in constructing composites with bilayer laminates, allowing for control of self-bending. Finite element simulations are employed to understand the processes of composite materials and accurately predict experimental results, reducing cost and development time.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Polymer Science
Mohammad Reza Khosravani, Hadi Sadeghian, Majid R. Ayatollahi, Tamara Reinicke
Summary: Due to the wide scope of applications of additive manufacturing (AM) in making final products, it is crucial to determine the mechanical strength and structural integrity of AM parts. This study focuses on the pin-bearing test to evaluate the stress response of fasteners, plates, and holes. Two polymer materials were used to fabricate samples, and the effects of specimen width and hole diameter on pin-bearing strength were investigated. Tensile tests were performed, and the failure behavior was analyzed using scanning electron microscopy and digital image correlation technique. The results provide insights for designing AM parts with improved mechanical strength.
Article
Materials Science, Multidisciplinary
Mohammad Reza Khosravani, Payam Soltani, Tamara Reinicke
Summary: The shape of the overlap area in adhesively bonded joints has a significant impact on the structural integrity and load carrying capacity of 3D-printed joints. Stepped-shape designs in the bonding area show better performance compared to conventional single-lap joints. Experimental and finite element simulation results reveal the fracture load and damage evolution mechanism in these 3D-printed bonded joints. This technique has the potential to be a competitive alternative to conventional 3D-printed single-lap joints.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Reza Khosravani, Peter Frohn-Soerensen, Bernd Engel, Tamara Reinicke
Summary: This research investigates the fracture behavior and crack propagation of cracked plates in 3D printing. Different fracture modes were obtained by changing the angle between the crack and the applied load. The study uses stereolithography (SLA) technique to fabricate specimens and finite element method and digital image correlation technique to determine stress intensity factors and strain field.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Saleh Gharaie, Ali Zolfagharian, Amir Ali Amiri Moghadam, Nurul Shukur, Mahdi Bodaghi, Bobak Mosadegh, Abbas Kouzani
Summary: This article develops a cost-effective extrusion system for a two-part high-viscous resin, and demonstrates the use of direct ink writing (DIW) method to fabricate soft and immensely stretchable structures. Through computational fluid dynamics analyses, a static mixer capable of evenly mixing the viscous resins is designed. The printing parameters are determined empirically and the mechanical properties of the printed samples are compared. Potential applications in soft robotics and medical training are demonstrated, providing a clear guide for utilizing DIW to 3D print highly stretchable structures.
PROGRESS IN ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Ali Zolfagharian, Peter Picken, Mahdi Bodaghi, Mohammad Fard, Bernard Rolfe
Summary: This research introduces a novel approach using metamaterials to improve the vibration isolation capacity of car seats. By developing metamaterial springs with high-static and low-dynamic stiffness, embedded in polyurethane foam, vibration isolation can be achieved. The study demonstrates the practical applications of implementing metamaterials into polyurethane foam under dynamic loading.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Polymer Science
Amirhossein Enayati Gerdroodbar, Hura Alihemmati, Mahdi Bodaghi, Mehdi Salami-Kalajahi, Ali Zolfagharian
Summary: Vitrimerization chemistry is a new method for converting polymer waste into high-value compounds, which can change permanent covalent bonds into reversible covalent adaptable networks. It adds unique properties such as shape memory, shape recovery, self-healing, and flexibility to polymers, and has wide applications in 3D printing.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Engineering, Manufacturing
Mohammad Reza Khosravani, Denis Anders, Tamara Reinicke
Summary: This study investigates the influence of post-processing on the fracture behavior of 3D-printed polymer components. The results show that while post-processing can improve the surface finish of the parts, it reduces their fracture toughness.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Hesam Soleimanzadeh, Bernard Rolfe, Mahdi Bodaghi, Marzieh Jamalabadi, Xiang Zhang, Ali Zolfagharian
Summary: This article presents the innovative applications of biodegradable soft robots and the manufacturing technology of biodegradable materials. The use of 3D and 4D printing of soft materials and multi-materials enables the direct manufacturing of soft robots with complex designs and functions. This is significant for the development of more sustainable robots for medical and industrial applications.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
