金属材料拉伸试验中夹持部分对力学性能的影响  

Influence of clamping part on mechanical properties of metal materials in tensile test

作　　者：尹玲 YIN Ling(China Merchants Chongqing Highway Engineering Testing Center Co.,Ltd.,Chongqing 400000,China)

机构地区：[1]招商局重庆公路工程检测中心有限公司,重庆400000

出　　处：《世界有色金属》2021年第12期188-189,共2页World Nonferrous Metals

摘　　要：金属材料力学性能检测最基础最有效的方式就是进行金属材料拉伸实验。国标GB/T288.1-2010中没有明确规定金属材料在拉伸实验中试样夹持部分的长度以及夹持时间。本文的研究方向是根据夹持试样头部长度上的差异,并通过实验判断其对金属材料力学性能指标产生的影响,并确定相关因素对其影响程度。在金属材料所具备的下屈服强度不明显,需用非比例延伸强度代替时,需保证金属材料试样加持头部的有效长度,对于金属材料标准试样直径Φ10毫米的圆棒拉伸试样,需保证其头部夹持有效长度尺寸在20mm以上。The most basic and effective way to test the mechanical properties of metal materials is to carry out the tensile test of metal materials.The national standard GB/t288.1-2010 does not specify the length and holding time of the specimen in the tensile test.The research direction of this paper is based on the difference of the length of the clamping sample head,and through experiments to determine its impact on the mechanical properties of metal materials,and determine the degree of influence of relevant factors on it.When the lower yield strength of the metal material is not obvious and needs to be replaced by the non proportional extension strength,the effective length of the holding head of the metal material sample should be ensured.For the round bar tensile sample with the diameter of Φ10 mm,the effective length of the holding head should be more than 20mm.

关 键 词：金属材料拉伸实验 夹持试样 有效长度 非比例延伸长度 下屈服强度 

分 类 号：TG115.52[金属学及工艺—物理冶金]