| 关凯书*,徐彤,宋明,赵立勋,王志文.小冲杆试验确定材料拉伸断后伸长率的研究[J].实验力学,2011,26(2):209~215 |
| 小冲杆试验确定材料拉伸断后伸长率的研究 |
| An Assessment of the Elongation of Fractured Specimen Subjected to Tensile Testing Based on Small Punch Testing |
| 投稿时间：2010-04-12 修订日期：2010-08-10 |
| DOI： |
| 中文关键词: 小冲杆试验 断后伸长率 拉伸试验 |
| 英文关键词:small punch test elongation after fracture tensile testing |
| 基金项目:国家自然基金资助(51075148); 质检总局公益性项目资助:在役设备材料性能小冲杆试验方法与标准研究(200810405) |
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| 中文摘要: |
| 小冲杆试验技术可以近似无损地测试材料的力学性能。本文对几十种材料进行了小冲杆试验研究,对小冲杆试样的轴向挠度δ与拉伸断后伸长率A进行了经验关联。研究表明,对于试验中涉及的几十种材料,二者之间没有统一的线性相关公式,但可以按材料的抗拉强度和屈强比将材料分类,然后分别对δ和A进行线性关联。对于抗拉强度小于600MPa的材料,可按屈强比为0.67将材料分为两类,分别构成两个线性经验公式。而对于抗拉强度大于600MPa的材料,尚没有找到明显的规律。 |
| 英文摘要: |
| Small Punch Test (SPT) with miniature specimen is a new technique applied to non-destructive evaluation of material mechanical properties. SPT was performed for dozens of materials to investigate the relationship between the axial deflection δ of SPT specimen and the elongation A of the fractured specimen subjected to tensile testing. Experimental results show that there is not a linear relation between δ and A for tested dozens of materials. But according to the ultimate tensile strength and yield-strength ratio, above-mentioned materials can be divided into different groups. Then the axial deflection δ of SPT can be linearly correlated to the A of the fractured specimen subjected to tensile testing in each group respectively. For materials, whose ultimate tensile strength is less than 600MPa, two groups can be devided according to the yield-strength ratio 0.67. A linear empirical correlation formula was proposed for each of group. No obvious correlation was found for materials whose ultimate tensile strength is larger than 600MPa, due to data insufficiency. |
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