| 引用本文: | 董文倩,刘郁丽,杨合.材料参数对3A21矩形管弯曲回弹的敏感性分析[J].材料科学与工艺,2011,19(5):1-5.DOI:10.11951/j.issn.1005-0299.20110501. |
| DONG Wen-qian,LIU Yu-li,YANG He.Sensitivity analysis of material parameters on spring-back of 3A21 aluminum alloy rectangular tube in the bending process[J].Materials Science and Technology,2011,19(5):1-5.DOI:10.11951/j.issn.1005-0299.20110501. |
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| 摘要: |
| 为了解材料参数波动对3A21铝合金薄壁矩形管弯曲回弹的影响,基于动态显式有限元软件ABAQUS,借助多因素敏感性分析方法,建立了薄壁矩形管弯曲回弹敏感性分析模型,对材料参数影响回弹的规律进行了敏感性分析.结果表明:弹性模量是影响3A21薄壁矩形管回弹最敏感的因素,其次分别为强度系数、初始屈服应力及硬化指数;弹性模量对回弹角与回弹半径的敏感度因子分别高达0.8872与0.9585;当弹性模量的输入值与实际值相差15%时引起的回弹角与回弹半径的相对误差分别为13.31%与14.38%,同时分别获得了强度系数、初始屈服应力及硬化指数存在15%的误差时引起的回弹角与回弹半径的相对误差值.通过敏感性分析剔除了非敏感因素,简化了材料参数对薄壁矩形管弯曲回弹影响的分析过程. |
| 关键词: 3A21铝合金 薄壁矩形管 材料参数 回弹 数值模拟 敏感性分析 |
| DOI：10.11951/j.issn.1005-0299.20110501 |
| 分类号:TG386 |
| 基金项目:国家自然科学基金资助项目(50575184;50975235);华中科技大学材料成形与模具技术国家重点实验室资助项目(08-3);西北工业大学基础研究基金资助项目(NPU-FFR-200809) |
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| Sensitivity analysis of material parameters on spring-back of 3A21 aluminum alloy rectangular tube in the bending process |
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DONG Wen-qian, LIU Yu-li, YANG He
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi′an 710072,China
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| Abstract: |
| To study the influence of material parameters on spring-back of 3A21 aluminum alloy thin-walled rectangular tube,a sensitivity analysis model is established based on ABAQUS and the multi-parameters sensitivity analysis method.The results show that: 1)The elastic modulus E is the most sensitive parameter for the spring-back,while the strength coefficient K,initial yield stress σs and strain hardening exponent n have a less influence on spring-back;2)The sensitive factors of elastic modulus E for the spring-back angle and spring-back radius could reach to 0.8872 and 0.9585,respectively;3)The relative error of spring-back angle δΔθ and spring-back radius δΔR could reach to 13.31% and 14.38% when the discrepancy between the input value and true value of elastic modulus E is 15%.Meantime,the relative error of spring-back angle and spring-back radius caused by the error of strength coefficient K,initial yield stress σs and strain hardening exponent n are obtained. |
| Key words: 3A21 aluminum alloy thin-walled rectangular tube material parameters spring-back numerical simulation sensitivity analysis |
