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zoe122208木虫 (正式写手)
superboy
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[求助]
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| 采用之前设计的板料尺寸进行试验时，B柱直壁处发生破裂。在B柱直壁开裂处边缘选取5个减薄严重点，首先进行厚度模拟值与试验值对比分析。结果表明，5个点数值模拟值与试验值吻合较好，最大误差为0.09mm。同时发现，试验值普遍高于模拟值，该现象与材料表明产生少量氧化有关。采用之前建立的成形极限图对试验件进行预测，发现直壁处材料应变值超过成形极限面，发生破裂，其余部分处于安全区域。之后，对其应变路径进行分析。可知5个点应变路径基本都经历了由拉-压、平面应变、拉-拉三个应变状态。经历的应变路径越复杂，材料破裂的可能性越大。 |
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zoe122208
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superboy
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3楼2013-11-12 15:30:08
youngdot
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zoe122208: 金币+5, ★有帮助 2013-11-13 10:33:16
zoe122208: 金币+5, ★有帮助 2013-11-13 10:33:16
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Before using design, the experiments of sheet size B column straight wall fracture. On the edge of the B column straight wall cracking in selected five thinning serious point, first of all thickness simulation value and experiment value comparison analysis.The results showed that five points accord well with those of numerical value and experimental value, maximum error is 0.09 mm.Also found that the test value is generally higher than the simulation value, the phenomenon related to material shows that produce a small amount of oxidation.Before using established to predict the forming limit diagram of test pieces, found straight wall material values of strain than forming limit surface, fracture, the rest in a safe area.After analysis of the strain path，Reveals five points strain path basic are experienced by the pull - pressure, plane strain, pull - three strain state. Experience of the more complex strain paths, the greater the chance of material fracture. 仅供参考！ |
2楼2013-11-12 10:45:02
befair
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zoe122208: 金币+75, 翻译EPI+1, ★★★★★最佳答案 2013-11-13 10:33:10
zoe122208: 金币+75, 翻译EPI+1, ★★★★★最佳答案 2013-11-13 10:33:10
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When using sheet metal dimensions from previous design in the tests, the vertical wall of B column fractured. At this crack's edge 5 critical thickness reduction spots are selected and comparison is made between the simulated and test thickness. The results show that at these spots the numerically simulated and test values are in good agreement and the maximum error is 0.09mm. At the same time it is found that test values are in general higher than the simulated ones and this phenomenon is related to the slight oxidation at the materiel surface. Predicting the test samples using the forming limit graph set up earlier, it is seen that the material strain value at the vertical wall exceeds the forming limit plane and fracture is resulted, while other parts remain in the safe zone. Afterwards the strain paths are analysed, which demonstrates that all the strain paths of the 5 points undergo generally the three strain states, namely stretching-press, plane strain, stretch-stretch strain. The more complex the paths go through, the more likely the material will fracture. 不大通顺，见谅 |
4楼2013-11-12 20:46:44
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