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Dynamic fracture testing in polymethyl-methacrylate (PMMA) single-edge notched beam
Polymer Testing ( IF 5.1 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.polymertesting.2020.106833 Wu Zhou , Jinxin Huang , Wei Huang , Dahsin Liu
Polymer Testing ( IF 5.1 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.polymertesting.2020.106833 Wu Zhou , Jinxin Huang , Wei Huang , Dahsin Liu
Abstract Dynamic fracture in single-edge notched polymethyl-methacrylate (PMMA) beams have been investigated by three-point-bending impact testing with a drop-weight machine. A high-speed camera combined with the digital image correlation (DIC) method is used to capture the impact-induced crack initiation and propagation, as well as the beam deformation fields and the open mode strain at the original notch tip. The crack propagation length is recorded and the instantaneous crack velocity is calculated. Furthermore, the dynamic fracture toughness KId is quantified from the loading-displacement relations at different impact velocities. The effects of the impact velocity and impact energy on dynamic fracture toughness, fracture initiation strain, as well as the corresponding influences on the fracture propagation velocity, are investigated.
中文翻译:
聚甲基丙烯酸甲酯 (PMMA) 单边缺口梁的动态断裂测试
摘要 单边缺口聚甲基丙烯酸甲酯 (PMMA) 梁的动态断裂已通过落锤机的三点弯曲冲击试验进行了研究。结合数字图像相关(DIC)方法的高速相机用于捕获冲击引起的裂纹萌生和扩展,以及原始凹口尖端处的梁变形场和开模应变。记录裂纹扩展长度并计算瞬时裂纹速度。此外,动态断裂韧性 KId 是根据不同冲击速度下的载荷-位移关系量化的。研究了冲击速度和冲击能量对动态断裂韧性、断裂起始应变的影响,以及对断裂扩展速度的相应影响。
更新日期:2020-11-01
中文翻译:
聚甲基丙烯酸甲酯 (PMMA) 单边缺口梁的动态断裂测试
摘要 单边缺口聚甲基丙烯酸甲酯 (PMMA) 梁的动态断裂已通过落锤机的三点弯曲冲击试验进行了研究。结合数字图像相关(DIC)方法的高速相机用于捕获冲击引起的裂纹萌生和扩展,以及原始凹口尖端处的梁变形场和开模应变。记录裂纹扩展长度并计算瞬时裂纹速度。此外,动态断裂韧性 KId 是根据不同冲击速度下的载荷-位移关系量化的。研究了冲击速度和冲击能量对动态断裂韧性、断裂起始应变的影响,以及对断裂扩展速度的相应影响。