| 引用本文: | 廖凯,吴运新.层削法在厚板内应力计算中的不确定度分析[J].材料科学与工艺,2014,22(4):86-90.DOI:10.11951/j.issn.1005-0299.20140415. |
| LIAO Kai,WU Yunxin.Uncertainty of stress determination by LRM in aluminum alloy thick plate[J].Materials Science and Technology,2014,22(4):86-90.DOI:10.11951/j.issn.1005-0299.20140415. |
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| 摘要: |
| 基于实验误差和模型误差,分析厚板应力测试不确定度产生的根源,确定每一种误差源的计算准则,并对误差源提取相应的厚板实验数据,对其不确定度进行计算.在获得总的应力测试的合成标准不确定度,对测试方法的误差进行分析.计算结果表明:层削法应力测试计算不确定度小于7 MPa,具有较高的测试精度.在模型误差和实验误差的综合作用下,层削法计算模型可以保持较高的准确性. |
| 关键词: 不确定度 铝合金厚板 内应力 层削法 |
| DOI：10.11951/j.issn.1005-0299.20140415 |
| 分类号:TG146.2 |
| 基金项目:国家自然科学基金资助项目(51475483);广西自然科学基金资助项目(2012GXNSFBA053150); 国家重点实验室(中南大学)开放基金资助项目(HPCM-2013-04); 湖南省科技计划资助项目(2014FJ3002). |
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| Uncertainty of stress determination by LRM in aluminum alloy thick plate |
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LIAO Kai1,2, WU Yunxin3
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(1. School of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410001,China; 2. Guilin University of Electrical Technology, Guilin 541004, China; 3. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)
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| Abstract: |
| Layer removal method(LRM) is a major method on the determination of stress measurement in thick plate. Uncertainty is a scientific method that can analyze accuracy of the internal stress determined by LRM and evaluate applicability of this method. Firstly, resource of generating uncertainty is found, and a calculation criterion for stress determination of thick plate must be given. Secondly, the experiment data is abstracted according with resource. Finally, a total and standard uncertainty is given by combined way based on experimental and model error. The conclusion is that the LRM has a high testing precision that the influence of uncertainty is not more than 7 MPa in a reasonable standard test condition. As a result of model error and experimental error, the calculation data of LRM can keep a high accuracy. |
| Key words: uncertainty aluminum alloy thick plate internal stress LRM |
