Article
Materials Science, Multidisciplinary
A. Moncy, J. P. Waldbjorn, C. Berggreen
Summary: This study introduced active and passive control methods for fatigue testing of composite materials, with active control showing better accuracy but lower fidelity when the real-time tracking system lost markers.
EXPERIMENTAL MECHANICS
(2021)
Article
Engineering, Industrial
Ruiqiang Zhang, Zhutao Shao, Zhusheng Shi, Trevor A. Dean, Jianguo Lin
Summary: The study reviewed existing cruciform specimen designs and proposed three different geometries to investigate fracture initiation locations and strain paths. It was found that Type III specimen has high potential for evaluating formability for sheet metal.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
S. S. Chen, D. Cai, J. J. Cui, G. Y. Li, H. Jiang
Summary: This study proposed two cruciform specimen design schemes suitable for 1.2 mm sheet materials. The strain localization characteristics were estimated and the thinning critical value in the central region was determined through simulations. The strain path history of the initial fracture point was obtained using a 3D digital image correlation test system. The fracture morphology characteristics were observed through SEM.
EXPERIMENTAL MECHANICS
(2023)
Article
Polymer Science
Sergio Horta Munoz, Maria del Carmen Serna Moreno
Summary: This article reviews the biaxial testing methodology applied to fibre-reinforced polymers, analyzing various parameters and factors. The most significant results of biaxial tests with cruciform specimens are collected, and proposed modifications in literature are detailed.
Article
Materials Science, Multidisciplinary
A. H. Siddiqui, J. P. Patil, S. Mishra
Summary: The study aims to design a novel cruciform specimen to achieve homogenous and maximum strain distribution at the gauge region. An optimized cruciform biaxial specimen was designed using a commercial finite element method, and was experimentally validated using 1050 Aluminum alloy sheet. The results showed that a cruciform sample with 60% thickness reduction at the gauge region achieved 87.5% of the fracture strain achieved during uniaxial tensile testing before breaking. The Barlat yield criteria was found to be the most accurate for AA1050 yield loci evaluation.
EXPERIMENTAL MECHANICS
(2023)
Article
Materials Science, Characterization & Testing
Yun-Mei Luo, Thanh Tung Nguyen, Hanane Attar, Luc Chevalier, Francois Lesueur
Summary: This paper presents a new vertical biaxial tensile machine for studying the behavior of PET near the blowing process. Tests conducted on PET and parameter fitting of an orthotropic thermo-visco-hyperelastic model are presented, discussed, and compared to previous measurements obtained from more complex apparatus.
Article
Materials Science, Multidisciplinary
Jinjae Kim, Jordan Hoffman, Dilip K. Banerjee, Mark A. Iadicola, Brad L. Kinsey, Jinjin Ha
Summary: A multi-interpolation method is proposed to determine the displacement trajectory of a non-standard cruciform specimen, achieving a linear stress path and constant triaxiality.
Article
Chemistry, Physical
Junxian Chen, Jianhai Zhang, Hongwei Zhao
Summary: The loading coaxiality of an in-plane biaxial test system and the structure of a cruciform specimen have a significant impact on the test results. This study proposed a method to quantify the loading coaxiality by utilizing automated machine learning to calculate alignment deviations. The experimental results demonstrated the effectiveness of this method in accurately quantifying alignment deviations and improving the reliability of test data.
Article
Materials Science, Multidisciplinary
Z. R. Wu, Y. S. Mao, H. Lei, S. Q. Wang, L. Fang
Summary: This paper analyzes the fatigue failure mechanism of nickel-based alloys under biaxial load. The fatigue life is divided into fatigue crack initiation life and fatigue crack propagation life. The stress intensity factor K at the crack tip of the cruciform specimen is calculated based on the scaling and superposition theory. Life prediction is performed using the first crack that appears in the cross-shaped specimen.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Junxian Chen, Jianhai Zhang, Hongwei Zhao
Summary: The stress uniformity within the gauge zone of a cruciform specimen has a significant impact on the in-plane biaxial mechanical properties of materials. By optimizing the geometry of the specimen, we were able to improve stress uniformity and reduce stress concentration, leading to reliable test data.
Article
Materials Science, Multidisciplinary
M. Ru, X. Q. Lei, X. M. Liu, Y. J. Wei
Summary: In this study, an equal-biaxial device for soft materials was designed and manufactured, which offers a convenient and cost-effective way to carry out biaxial tests. The device uses a novel load system and a set of non-contact laser extensometer to ensure accurate and reliable results.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
X. Yang, Z. R. Wu, Y. R. Yang, Y. Pan, S. Q. Wang, H. Lei
Summary: This research proposes a method for designing and optimizing cruciform specimens. Through parameter modeling and genetic algorithm-based optimization, the method achieves a more uniform stress distribution and demonstrates high efficiency and applicability.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
Shiwei Han, Tien Dung Dinh, Ives De Baere, Wim Van Paepegem
Summary: Stereo Digital Image Correlation (stereo-DIC) was used to measure the strain distribution in strain-controlled fatigue testing of 304 stainless steel. The study found that even when following the ASTM standard, uniformity in strain distribution under compression cannot be guaranteed, which may invalidate the calibrated constitutive laws.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Crystallography
Wen-Jie Bao, Jia-Yu Liu, Zhi-Lin Tao, Guang-Zhou Zhao, Chang-Yu Zhou
Summary: The biaxial fatigue crack growth behavior of commercial pure titanium TA2 cruciform specimens with different crack inclination angles, load ratios, and stress ratios was studied using an IPBF-5000 biaxial testing machine. The results show that the maximum tangential stress criterion is suitable for predicting the initiation angle of fatigue cracks. The crack growth rate decreases with increasing biaxial load ratio and increases with the stress ratio. The Walker model and Kujawski model have better compression effects on fatigue crack growth data than the Paris model.
Article
Mechanics
Zelin Yan, Feng Dai, Yi Liu, Mingdong Wei, Wei You
Summary: This study investigates the progressive failure process of flattened Brazilian disc (FBD) specimen using digital image correlation technique and proposes a modified calculation method to determine mode-I fracture toughness KIC. Additionally, the cracking nature of secondary cracks and the second rise of loading force induced by compressionshear failure near the flattened ends of the FBD specimen are identified. These findings contribute to a better understanding of the progressive fracture mechanism of FBD specimens and enhance the accuracy of KIC calibration by FBD testing method.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Aerospace
Rajeev Ranjan, H. Murthy, V. S. Sadavarte, S. M. Pande, Debdas Bhowmik
Summary: This study investigates the mechanical response of composite solid propellants under large strain through tensile tests. Results show that true strain is greater than nominal strain, and an increase in displacement rate leads to an increase in tensile modulus and a decrease in failure strain.
INTERNATIONAL JOURNAL OF ENERGETIC MATERIALS AND CHEMICAL PROPULSION
(2021)