基于压杆后屈曲的工程材料形变行为及弹性模量测定  

Deformation behavior and elastic modulus of engineering materials based on compressive rod post-buckling

作　　者：姜松[1] 施小燕[1] 曾昕鑫[1] 徐斌[1] 

机构地区：[1]江苏大学食品与生物工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2014年第1期107-114,共8页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省高校自然科学研究基金资助项目(11KJA550002);江苏高校优势学科建设工程项目

摘　　要：用扫描仪测定了8种工程材料的端部转角和中点挠度，用TA—XT2i物性仪测定了其弹性模量，同时用三点弯曲法测定65Mn钢弹性模量．结果表明：8种材料后屈曲形变行为与理论相符，中点挠度误差均小于5％，端部转角误差均小于6％；压杆后屈曲法弹性模量测定值与公称值吻合。比三点弯曲法更准确，压杆后屈曲法适用于工程材料．压杆后屈曲法测量弹性模量的最佳端部转角为20°～25°，金属片的最佳厚度为0．2～O．3mm，长度为150—180mm；0．38mm厚PVC片最佳长度为180mm；80mm长PET片的最佳厚度为0．5mm；铜版纸的最佳长度为100mm，宽度为30mm；竹片的最佳长度为180mm，厚度为1．0rnm左右．The end bending angles and the middlepoint deflections of eight engineering materials were analyzed by a scanner. The elastic modulus of samples were tested based on compressive rod postbuck ling by TA XT2i Texture Analyzer, and the results of 65Mn steel were compared with those by three point bending method. The results show that the deformation behaviors of eight materials are consistent with theoretical calculations, and the errors of middlepoint deflection are below 5% with the errors of end bending angles below 6%. The experimental results of elastic modulus of metal sheets are all in good agreement with the nominal values, and the method based on compressive rod postbuckling is better than that based on threepoint bending. The proposed method is suitable for measuring elastic modulus of engi neering materials. The optimum end bending angle of the method is 20°～25°, and the optimum thickness and length of metal sheets are 0. 2 0. 3 mm and 150 180 mm, respectively. The optimum length of PVC sheets with thickness of 0. 38 mm is 180 mm, while the optimum length of PET sheets with thickness of 0. 5 mm is 80 mm. The optimum length and width of art paper are 100 mm and 30 mm, respectively. The optimum length and thickness of bamboo are 180 mm and 1.0 mm, respectively.

关 键 词：工程材料 压杆后屈曲 弹性模量 形变行为 图像分析 

分 类 号：TB302.3[一般工业技术—材料科学与工程]