Article
Engineering, Mechanical
Mohammad Reza Khosravani, Payam Soltani, Tamara Reinicke
Summary: This study investigates the fracture behavior of adhesively bonded 3D-printed joints using PETG material. By analyzing different 3D printing parameters and adhesive layer thickness, the mechanical behavior of PETG joints is determined, providing valuable insights for the development of new designs with higher strength and better structural performance.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Chemical
Marvin Kaufmann, Till Vallee
Summary: Current studies show great potential for mechanical optimization of adhesively bonded joints, but the potential is not fully utilized. Existing approaches focus on changing the geometry of the joints to redistribute stress peaks and improve load capacity, but fail to find a general optimal solution. This paper proposes an optimization methodology based on a failure criterion to improve the efficiency and eliminate underutilized spots of material in adhesive bonding.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Materials Science, Characterization & Testing
Mohammad Reza Khosravani, Payam Soltani, Kerstin Weinberg, Tamara Reinicke
Summary: This study investigated the influence of 3D printing parameters and adhesive thickness on the performance of adhesively bonded joints using FDM process and PLA material. The agreement between experimental observation and numerical results provides valuable insights for further development in the field.
Article
Engineering, Civil
Armin Yousefi Kanani, Xiaonan Hou, Rachael Laidlaw, Jianqiao Ye
Summary: A comparative study on different adhesive joint configurations revealed that the scarf joint performed the best. Increasing overlap length was beneficial for certain configurations while the mechanical properties of the adherends significantly affected failure mechanisms.
ENGINEERING STRUCTURES
(2021)
Review
Engineering, Aerospace
Eric Paroissien, Frederic Lachaud, Sebastien Schwartz
Summary: This article introduces the role and importance of various connection technologies in aerospace structures, and proposes simplified modeling and solution schemes for predicting load transfer.
PROGRESS IN AEROSPACE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Scott E. Stapleton, Bertram Stier, Stephen Jones, Andrew Bergan, Ibrahim Kaleel, Marco Petrolo, Erasmo Carrera, Brett A. Bednarcyk
Summary: This study compared the predictive performance of five design models on local stress fields, and found that lower fidelity models have advantages in saving computational and user time.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Aerospace
Ferhat KADIOGLU
Summary: Adhesive Single Lap Joints were studied under quasi-static buckling conditions, revealing different failure mechanisms and influencing factors through experimental and modeling analyses.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Mechanical
Andrea Spaggiari, Filippo Favali
Summary: This study evaluates and explores the combination of additive manufacturing polymeric technology and structural adhesives. The findings show that structural adhesives can be used to expand the size of 3D printed parts while maintaining the advantages of freedom of shape and low cost. The results demonstrate the potential of bonding polymeric additive manufactured parts, although there are challenges such as bending stresses and notches in the lap joints. This study provides practical implications for the design of additive manufactured and adhesive-bonded parts.
RAPID PROTOTYPING JOURNAL
(2022)
Article
Engineering, Mechanical
Mohammad Reza Khosravani, Payam Soltani, Tamara Reinicke
Summary: This review summarizes recent advancements in failure and fracture of adhesively bonded joints with 3D-printed polymeric adherends, including experimental studies, approaches to strength improvement, and finite element modeling. The documented data is of great significance for comparison, improvement, and future research on 3D-printed joints.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Chemical
Safdar Ali Khan, Seyed Saeid Rahimian Koloor, Wong King Jye, Noorfaizal Yidris, Ab Aziz Mohd Yusof, Mohd Al Fatihhi Mohd Szali Januddi, Mohd Nasir Tamin, Mahzan Johar
Summary: Adhesive bonding can join two different substrate materials together by forming chemical bonds. The mechanical properties of the adhesive material can easily change due to the loading rate and deformation mode. This study aims to evaluate the strain rate effect on the damage response of adhesive joints for Mode I loading scenarios. The experimental and FE simulation results show a good correlation.
Article
Engineering, Chemical
Xiao Wei, Hui-Shen Shen, Hai Wang
Summary: This paper investigates the fracture failure behavior of composite double lap joints under uniaxial tensile load. A physical model taking into account both interface energy and geometric nonlinearity is proposed, and the interface parameters are determined through experiment-based approach. The failure load of the double lap joints is predicted using the energy-stress coupled criterion in the framework of finite fracture mechanics. The actual failure mode of the joints is captured using a high-speed camera, and the numerical predictions are validated against experimental results. The effects of interface energy, geometric nonlinearity, and joint asymmetry on the strain energy release rate curves are discussed.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Engineering, Chemical
N. Carrere, A. Doitrand, E. Martin, D. Leguillon
Summary: Epoxy adhesives are ideal for assembling certain materials, but pores can affect crack initiation and final strength. This study investigates the impact of small voids undetectable by traditional testing methods. A method combining strength and toughness criteria is used to analyze failure mechanisms in the presence of pores, with calculations showing how defects near edges and stress concentrations affect load at failure.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Mechanics
Serif Citil
Summary: This study investigated the effect of curved-lap joints on the strength of adhesive bonding. The results indicated that the thickness, overlap length, and curvature radius of the adherends significantly influence the failure loads.
JOURNAL OF THEORETICAL AND APPLIED MECHANICS
(2021)
Article
Materials Science, Composites
M. Gokhan Atahan, M. Kemal Apalak
Summary: The development of a realistic numerical model that predicts the impact behavior of adhesively bonded composite joints is important for various industries. The study aims to develop a numerical model that can accurately predict the low-velocity oblique impact behavior of composite single-lap joints. The proposed model was validated using experimental results and showed good agreement with regards to contact force-time variations and adhesive damage.
APPLIED COMPOSITE MATERIALS
(2023)
Article
Engineering, Mechanical
Shweta Paunikar, S. Gopalakrishnan
Summary: This paper presents a computational model based on the frequency domain spectral finite element method (SFEM) for studying wave propagation in metallic and composite adhesively bonded single lap joints. The model uses spectrally formulated beam and ECDB elements to represent the joint. Through detailed analysis of the ECDB dynamics and validation of high frequency wave propagation responses, the model's accuracy and efficiency in understanding ultrasonic wave propagation in adhesively bonded joints are demonstrated.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2022)
Article
Multidisciplinary Sciences
Mohammad Reza Khosravani, Filippo Berto, Majid R. Ayatollahi, Tamara Reinicke
Summary: This paper discusses the effects of two printing parameters on the mechanical behavior of additively manufactured components. Based on experimental results, the strength and stiffness of the examined specimens are determined, and the dependency of the strength and elastic modulus of 3D-printed parts on the raster orientation is documented.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Mechanical
Mohammad Reza Khosravani, Zeljko Bozic, Ali Zolfagharian, Tamara Reinicke
Summary: This study investigates the effects of accelerated thermal ageing on the mechanical behavior of 3D-printed parts and describes the influence of manufacturing defects on the fracture behavior of these components. The results indicate the effects of thermal ageing on the structural integrity of the specimens, which were printed with different raster orientations.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Automation & Control Systems
Morteza Mohammadzahri, Arman Khaleghifar, Mojtaba Ghodsi, Payam Soltani, Sami AlSulti
Summary: This paper proposes a discrete approach to consider the commonly overlooked communication/processing delays in digital control systems for the feedback linearization control of mechanical systems. The proposed approach improves performance and eliminates the need for continuous derivative terms.
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
Energy & Fuels
Mojtaba Ghodsi, Morteza Mohammadzaheri, Payam Soltani
Summary: This research presents a design guideline for a kinetic energy converter using a cantilever triple-layer piezoelectric harvester (CTLPH) for low-frequency applications. The analytical equations for harvested voltage and power were developed based on the constitutive and internal energy equations. The study found that various factors such as motion frequency, tip force, piezoelectric coefficients, dimensions, and mechanical properties of the layers significantly affect the performance of the harvester.
Article
Energy & Fuels
Morteza Mohammadzaheri, Sami Al-Sulti, Mojtaba Ghodsi, Payam Soltani
Summary: This article reviews the position control of piezoelectric actuators, particularly charge-based sensorless control systems. It focuses on comparing type I and type II charge estimators for piezoelectric actuators. Experimental results show that type II estimators can estimate a higher amount of charge compared to type I estimators with the same loss in excitation voltage. However, this research concludes that capacitor-based (type I) charge estimators can still be the prime solution for many charge estimation problems.
Article
Engineering, Mechanical
Bahador Bahrami, Hossein Talebi, Majid R. Ayatollahi, Mohammad Reza Khosravani
Summary: This research demonstrates the application of artificial neural network (ANN) in predicting fracture under mixed-mode I/II loadings. By analyzing the importance of different input factors, crack parameters and material properties are selected as input data. Multiple ANN models are trained and optimized using different algorithms. The optimized models show low errors and high accuracy in predicting fracture, indicating the effectiveness and potential wide range application of data-driven fracture predictions compared to traditional physics-based criteria.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(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
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, 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
Mechanics
Mohammad Reza Khosravani, Payam Soltani, Tamara Reinicke
Summary: With the advancement of Additive Manufacturing (AM), its applications have diversified from prototypes to functional end-use products. Therefore, ensuring structural integrity and mechanical strength of additively manufactured parts has become crucial. In this study, two simulation case studies were conducted to model the AM process and the manufactured parts. The simulation software Simufact and Finite Element software Abaqus were used for examining residual stresses and structural integrity of the parts, respectively. The findings of this study can be utilized for future designs of additively manufactured components.
MECHANICS RESEARCH COMMUNICATIONS
(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)
Proceedings Paper
Construction & Building Technology
Mohammad Reza Khosravani, Tamara Reinicke
Summary: This study investigates the fracture behavior of PLA-wood composites produced by 3D printing. The mechanical characteristics of intact and defected specimens are compared, and the influence of raster orientation on fracture behavior is examined.
4TH INTERNATIONAL CONFERENCE ON STRUCTURAL INTEGRITY (ICSI 2021)
(2022)
