| 金属标准拉伸试验中"反走"现象机理 |
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| 引用本文： | 唐亮,杨昌棋.金属标准拉伸试验中"反走"现象机理[J].实验室研究与探索,2011,30(5). |
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| 作者姓名： | 唐亮 杨昌棋 |
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| 作者单位： | 重庆大学,资源与环境科学学院,工程力学系,重庆,400030 |
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| 摘 要： | 针对金属标准拉伸试验中,上下夹具偏心所导致的试验初期变形曲线往负方向延伸的"反走"现象,建立了一套考虑夹具偏心及夹持偏角的试样受力理论模型.特别对常用的楔形夹具在试验过程中产生的零夹持角和非零夹持角情况进行了分析,推导出试样应变与夹持力间的关系.分析了试验中产生变形值"反走"现象的机理,通过ABAQUS有限元软件对引伸计-试样联合模型进行了数值仿真.结果表明,理论分析、实验实测,以及有限元数值模拟所得结果具有良好的一致性.得出:试验初期在偏心所产生的误差占主导地位的并不是通常认为的偏心弯矩,而是上下楔形夹具夹持方式产生的侧向力以及附加弯矩的联合作用,解释并模拟了变形的"反走"现象,为进一步提高变形测量精度提供了新的思路.
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| 关 键 词： | 变形测量 引伸计 偏心拉伸 弯曲变形 反走现象 |
Mechanisms of Reversal Phenomenon in Metal Standard Tensile Test |
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| TANG Liang,YANG Chang-qi.Mechanisms of Reversal Phenomenon in Metal Standard Tensile Test[J].Laboratory Research and Exploration,2011,30(5). |
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| Authors: | TANG Liang YANG Chang-qi |
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| Institution: | TANG Liang,YANG Chang-qi(Department of Engineering Mechanics,Resource and Environmental Science College,Chongqing University,Chongqing 400030,China) |
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| Abstract: | In the standard method of metal tension test,eccentricity between the upper and lower clamp has notable impact on the deformation measurement.The analysis of wedge-shaped fixture in zero angle and non zero angle during the testing was given,and the relationship between clamping force and strain was calculated.A theoretical model considering the clamp eccentric and angle of deflection was established to analyze the mechanism of reversal phenomenon.The numerical simulation for extensometer-specimen combined m... |
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| Keywords: | deformation measurements extensometers eccentric tension bending distortion reversal phenomenon |
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