DSCM测量铸铁裂纹尖端演化过程  

Cast iron crack tip′s evolvement measured by DSCM

作　　者：张怀清[1] 蒲琪[1] 代祥俊[1] 云海[1] 张东焕[1] 

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255049

出　　处：《山东理工大学学报（自然科学版）》2010年第1期30-34,共5页Journal of Shandong University of Technology:Natural Science Edition

摘　　要：基于梯度的搜索算法计算亚像素位移、基于位移场局部最小二乘拟合计算应变场.测量了铸铁预制裂纹三点弯曲梁裂纹尖端的演化过程,给出了试件加载过程中的全程荷载-位移曲线以及试件裂纹扩展的过程.由DSCM分析结果,给出了试件在不同加载阶段下裂纹尖端的位移场及应变场.The principle of digital speckle correlation method（DSCM） was introduced,and the sub-pixel searching algorithm based on gradient was used to compute displacement.The strain fields were computed by least-square fitting of local displacement.The crack tip＇s evolvement of cast iron three-point bending beam with pre-crack was measured.The load-displacement curve and the process of crack growth were given during the specimen damage.The displacement field and stain field near crack tip at different load were given by DSCM.This study provides experimental basis for researching brittle materials＇ damage and fracture process,and also provides an effective experimental way for studying damage and fracture process of structures with crack.

关 键 词：数字散斑相关 裂纹扩展过程 裂纹尖端变形场 

分 类 号：TN247[电子电信—物理电子学]