Article
Materials Science, Multidisciplinary
Giuseppe Mirone, Raffaele Barbagallo, Michele Maria Tedesco, Daniele De Caro, Matteo Ferrea
Summary: This study focuses on the experimental derivation of the flow curves of heat-resistant high-strength steels under dynamic strain rates and the effects of moderate temperatures induced by self-heating at static rates.
Review
Engineering, Civil
Tarun Nanda, Vishal Singh, Gurpreet Singh, Manpreet Singh, B. Ravi Kumar
Summary: The automotive industry is striving to achieve lightweight body-in-white structures to meet strict regulations on emissions and crash testing. Advanced high strength steels are increasingly used in the automotive industry due to their improved crashworthiness and formability at reasonable costs. The multi-phase microstructures of AHSS provide superior strength-ductility combination compared to conventional high-strength steels.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Engineering, Manufacturing
Manaswini Chinara, Surajit Kumar Paul, Sudin Chatterjee, Subrata Mukherjee
Summary: Hole expansion ratio (HER) is a widely used measurement for the stretch-flangeability of sheet metal, determined by the maximum limit of successful expansion of a central hole. The HER of a punched hole is related to the uniaxial tensile properties, anisotropy, and deformation parameters of the steel grades. Comparisons among different steel grades are essential to understand the relationship between HER and other mechanical properties. Interstitial free steel has the highest HER, while SPFH steel has the lowest HER among the four steel grades. The HER correlates well with the notch mouth opening displacement at peak load.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Review
Automation & Control Systems
Imtiaz Ali Soomro, Srinivasa Rao Pedapati, Mokhtar Awang
Summary: Resistance spot welding is the most preferred joining technique in the automotive industry, but it faces challenges such as complex phase transformations and elemental segregation. Recent advances in interlayer assisted RSW, magnetically assisted RSW, and pulsed-RSW show potential in improving joint mechanical performance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Lizhong Dong, Ming Ren, Yulian Wang, Guanghua Wang, Shiqin Zhang, Xulin Wei, Jianfeng He, Bo Cui, Yueran Zhao, Panpan Xu, Xiaona Wang, Jiangtao Di, Qingwen Li
Summary: This study reports an artificial neuromuscular fiber that integrates sensing and actuation capabilities, similar to a snail tentacle. By using a combination of carbon nanotube fiber core, elastomer layer, nanofiber network, and MXene/CNT thin sheath, this intelligent fiber achieves sensitive touch/stretch perception and hysteresis-free cyclic actuation tracing.
Article
Chemistry, Physical
S. S. Dash, D. J. Li, X. Q. Zeng, D. L. Chen
Summary: Aluminum alloy is widely used in the automotive industry for its lightweight and high-performance characteristics. This study focused on the microstructure and strain rate effects on the tensile deformation behavior of a high-pressure die-cast Silafont*-36 alloy, revealing unique heterogeneous microstructures and strain hardening behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Civil
Wei Li, Hao Chen
Summary: In order to meet the increasing demand on the mechanical properties of steels at high strain rates, split Hopkinson tensile bar (SHTB) tests were carried out for three structural steels, Q355 steel, Q460 steel and Q620 steel. Four strain rate levels, 1000 s-1, 2000 s-1, 3000 s-1 and 4000 s-1, were used in the tests. Quasi-static tensile loading tests were also performed for comparison. Fracture morphology and metallographic organization were observed to reveal the mechanism of steel under high strain rate loading. A stress-strain relationship model based on the modified Johnson-Cook model was proposed and calibrated using data from both quasi-static tensile tests and SHTB tests. The results show that the effect of strain rate hardening on the strength of steel is significant, and the proposed model can well describe the mechanical behaviour of these three structural steels at high strain rates.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Qiang Fu, Xu Zhao, Zhaorui Zhang, Gang Peng, Xiaohui Zeng, Ditao Niu
Summary: The dynamic splitting tensile behavior of hybrid basalt-polypropylene fiber-reinforced concrete (HBPRC) was studied, showing an increase in strength and energy dissipation capacity with higher strain rates. The effects of fiber type and content on strain rate sensitivity were consistent with dynamic dissipation energy. Additionally, the addition of basalt and polypropylene fibers improved concrete strength, with the hybrid combination showing the most significant enhancement.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Engineering, Civil
Eunsoo Choi, Jongkwon Choi, Junwon Seo
Summary: This study investigated the effect of fiber content and recovery stress on the dynamic direct tensile resistances of reinforced mortar. Results showed that adding fiber content increased tensile resistances in static tests, while recovery stress enhanced post-cracking strength and reduced strain capacity. In dynamic tests, peak strength reduction was attributed to reinforced mortar sensitivity, with 1.5% fiber content specimens showing higher toughness and strain capacity compared to 1.0% fiber content specimens. Recovery stress had a greater effect on 1.0% fiber content specimens, and all resistance parameters were sensitive to strain rate, especially for the 1.5% fiber content specimens.
ENGINEERING STRUCTURES
(2022)
Article
Metallurgy & Metallurgical Engineering
Nuri Sen, Tolgahan Civek
Summary: DP advanced high strength steels have an important role in the automotive industry, but their excellent strength increases formability issues. Therefore, new forming processes need to be implemented to fully utilize their excellent properties. This study investigated the formability and deformation behavior of DP steels through tensile tests, and the results showed that the formability of DP steels is better at high temperatures.
IRONMAKING & STEELMAKING
(2022)
Article
Materials Science, Multidisciplinary
Jairo Alberto Munoz, Mariela Melia, Martina Avalos, Raill E. Bolmaro
Summary: Commercially pure grade 2 titanium sheets were processed using equal channel angular sheet extrusion (ECASE) up to two passes at room temperature, resulting in a heterogeneous microstructure with high twin densities near the sheet edges. This heterogeneity increased material strength by 200 MPa while maintaining a 10% uniform deformation zone. The strength improvement was mainly attributed to grain size reduction induced by twins near the edge areas during deformation.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Ning Zhao, Qiangqiang Zhao, Yanlin He, Rendong Liu, Weisen Zheng, Wenyue Liu, Yu Zhang
Summary: Two cost-saving marine steels with 1000 MPa yield strength were investigated for hydrogen embrittlement behavior using electrochemical technique. The hydrogen embrittlement resistance of steel B was found to be superior to steel A, potentially due to the presence of more nano-sized NbC particles. Additionally, the interface between carbide and matrix played a significant role in hydrogen trapping.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Johann Petit, Xiaoxue Pu, Isabelle Darbord-Ranc, Daniele Wagner
Summary: This paper aims to study the sensitivity of carbon-manganese (C-Mn) structural steels to dynamic strain aging (DSA) during deformation between 100 and 350 degrees C. The DSA effect is observed through the thermal response of C-Mn steels during ultrasonic fatigue tests and is correlated with results from internal friction tests. The study also reveals a distinct difference between DSA and the classical dislocation glide mechanism, as well as the emergence of a stress threshold of irreversibility.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Alexandre Mathevon, Damien Fabregue, Veronique Massardier, Sophie Cazottes, Philippe Rocabois, Michel Perez
Summary: The Hy-MFC model was developed to predict the tensile properties of dual-phase steels based on microstructure parameters. It can be used for a wide range of steels and allows for alloy design and production-line monitoring. By considering the prior austenitic grain size and martensite composition, the model showed good agreement with experimental data, particularly for steels with various martensite fractions. Additionally, electron backscatter diffraction monitoring during tensile tests helped understand the interactions necessary for macroscopic hardening in dual-phase steels, with a proposed hybrid scaling transition law for small deformations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Analytical
Francesco Falcetelli, Alberto Martini, Raffaella Di Sante, Marco Troncossi
Summary: This paper critically reviews the advantages and challenges of SMT in the automotive industry, and presents a case study to demonstrate its potential application in automotive modal analysis.