摘要
在Abaqus平台上采用扩展有限元方法(Extended Finite Element Method,XFEM),对ECC(Engineered Cementitious Composites)应变硬化材料,采用3点弯曲切口梁模拟结构的裂纹扩展情况以及缝端的应力-应变分布情况,将计算结果与试验结果进行比较,验证XFEM在模拟应变硬化材料裂缝扩展方面的有效性和准确性.结果表明,模拟结果可以为全桥、半桥应变片的粘贴位置提供更为精确的指导;XFEM法可以模拟ECC的裂缝扩展过程,并预测ECC裂缝扩展长度的大小,但XEFM未能模拟出多裂纹的扩展过程,导致仿真结果比实验结果偏小;模拟得到的起裂荷载和峰值荷载与试验结果较为接近,而峰值荷载与试验结果的误差仅为7.56%,为应变硬化材料实际带裂纹工作的工程问题提供了解决问题的方法.最后,提出利用能量的概念来评价ECC的应变硬化程度更为合理.
The Extending Finite Element Method （XFEM）by ABAQUS was used to simulate the crack propagation,the stress and strain distribution of the notched ECC （Engineered Cementitious Composites） beam under three point bending. And the effectiveness and accuracy of XFEM in the crack expansion simulation of this strain hardening material of ECC were verified in accordance with the comparisons between calculated and test results. The analysis showed that the simulated results can provide an exact guidance for pasting position of the full bridge and half bridge strain gauge.Also XFEM can simulate the process of crack propagation and forecast the crack propagation length.However, the process of multi-crack propagation was not simulated by XFEM, therefore, calculated result of the crack propagation length is smaller than that in the test.The initial crack load of simulation showed a good coincide with test results, especially the error of peak load between the test and simulation results was 7. 56%. Therefore, the simulation results can suggest a method to solve the cracking problem of the strain hardening materials. Finally,according to energy concept to evaluate the degree of strain hardening ECC is suggested.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2015年第2期359-368,共10页
Journal of Basic Science and Engineering
基金
国家自然科学基金(51108151)
江苏省土木工程材料重点试验室开放基金
国家重点基础研究发展计划(973计划)项目(2009CB623203)
河北省自然科学基金(E2012202097)
关键词
ECC
三点弯曲切口梁
仿真分析
扩展有限元法
裂纹扩展
Engineered Cementitious Composites
the simulation analysis
extended finiteelement method
crack propagation
