基于表观断裂韧性的Ⅰ-Ⅱ型复合断裂准则分析
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摘要
以Ⅰ-Ⅱ复合型裂纹结构为研究对象,对紧凑拉伸剪切试样(CTS)的剩余强度及开裂方向进行了理论分析及试验研究,推导出了仅与CTS结构加载角度相关的破坏载荷公式,并建立有限元模型(FEM),获取结构的表观断裂韧性值,试验验证了模型的可行性。通过对比不同断裂准则在开裂角、临界载荷及复合断裂韧度方面的工程适用性,表明基于von Mises应力的复合型断裂准则更有利于工程分析,为结构的承载能力评估提供了技术支持。
The residual strength and initial crack opening direction of Compact Tension Shear(CTS)specimens of Ⅰ/Ⅱ crack structure were studied based on theoretical analysis and experiments. In view of the proposed failure load for CTS structure,the apparent fracture toughness of mixed mode Ⅰ-Ⅱ crack structure can be obtained by Finite Element Model(FEM),which has a good agreement with experimental results. Compared the existing fracture criterion with experimental results in crack opening angle,limit load and mixed-mode fracture toughness,mixed model fracture toughness based on von Mises yield stress is most fit to engineering analysis,which provides a strong support for the carrying load capability analysis of mixed mode crack structure.
The residual strength and initial crack opening direction of Compact Tension Shear(CTS)specimens of Ⅰ/Ⅱ crack structure were studied based on theoretical analysis and experiments. In view of the proposed failure load for CTS structure,the apparent fracture toughness of mixed mode Ⅰ-Ⅱ crack structure can be obtained by Finite Element Model(FEM),which has a good agreement with experimental results. Compared the existing fracture criterion with experimental results in crack opening angle,limit load and mixed-mode fracture toughness,mixed model fracture toughness based on von Mises yield stress is most fit to engineering analysis,which provides a strong support for the carrying load capability analysis of mixed mode crack structure.
引文
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[10]Demir O,Ayhan A O,Iric S.A new specimen for mixed mode-I/II fracture tests:modeling,experiments and criteria development[J].Engineering Fracture Mechanics,2017,178:457–476.
[11]Husaini,Kishimoto K.Investigations of the mixed mode crack growth behavior of an aluminum alloy[J].ARPN Journal of Engineering and Applied Sciences,2016,11(2):885-890.
[2]Erdogan F,Sih G C.On the crack extension in plates under plane loading and transverse shear[J].Journal of Basic Engineering,1963,85:519–525.
[3]Sih G C.Strain energy density factor applied to mixed mode crack problems[J].International Journal of Fracture,1974(10):305-321.
[4]任利,朱哲明,谢凌志,等.复合型裂纹断裂的新准则[J].固体力学学报,2013,34(2):31-37.Ren Li,Zhu Zheming,Xie Lingzhi,et al.New fracture criterion for mixed mode cracks[J].Chinese Journal of Solid Mechanics,2013,34(2):31-37.(in Chinese)
[5]Qian J,Fatemi A.Mixed mode fatigue crack growth:a literature survey[J].Engineering Fracture Mechanics,1996,55(6):969-990.
[6]Richard H A,Schramm B,Schirmeisen N H.Cracks on mixed mode loading–theories,experiments,simulations[J].International Journal of Fatigue,2014,62:93-103.
[7]Richard H A.Safety estimation for construction units with cracks under complex loading[J].International Journal of Materials&Product Technology,1988(3):326–338.
[8]Demir O,Ayhan A O.Investigation of mixed mode-I/II fracture problems-Part 2:evaluation and development of mixed modeI/II fracture criteria[J].Fracture of Engineering Materials and Structures,2016,35:340–349.
[9]Banks-Sills L,Arcan M.An edge-cracked mode II fracture specimen[J].Experimental Mechanics,1983,23:257-261.
[10]Demir O,Ayhan A O,Iric S.A new specimen for mixed mode-I/II fracture tests:modeling,experiments and criteria development[J].Engineering Fracture Mechanics,2017,178:457–476.
[11]Husaini,Kishimoto K.Investigations of the mixed mode crack growth behavior of an aluminum alloy[J].ARPN Journal of Engineering and Applied Sciences,2016,11(2):885-890.