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zoe122208木蟲 (正式寫手)
superboy
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[求助]
幫忙翻譯
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| 采用之前設(shè)計(jì)的板料尺寸進(jìn)行試驗(yàn)時(shí)，B柱直壁處發(fā)生破裂。在B柱直壁開裂處邊緣選取5個(gè)減薄嚴(yán)重點(diǎn)，首先進(jìn)行厚度模擬值與試驗(yàn)值對(duì)比分析。結(jié)果表明，5個(gè)點(diǎn)數(shù)值模擬值與試驗(yàn)值吻合較好，最大誤差為0.09mm。同時(shí)發(fā)現(xiàn)，試驗(yàn)值普遍高于模擬值，該現(xiàn)象與材料表明產(chǎn)生少量氧化有關(guān)。采用之前建立的成形極限圖對(duì)試驗(yàn)件進(jìn)行預(yù)測(cè)，發(fā)現(xiàn)直壁處材料應(yīng)變值超過成形極限面，發(fā)生破裂，其余部分處于安全區(qū)域。之后，對(duì)其應(yīng)變路徑進(jìn)行分析�？芍�5個(gè)點(diǎn)應(yīng)變路徑基本都經(jīng)歷了由拉-壓、平面應(yīng)變、拉-拉三個(gè)應(yīng)變狀態(tài)。經(jīng)歷的應(yīng)變路徑越復(fù)雜，材料破裂的可能性越大。 |
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youngdot
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【答案】應(yīng)助回帖
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zoe122208: 金幣+5, ★有幫助 2013-11-13 10:33:16
zoe122208: 金幣+5, ★有幫助 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. 僅供參考！ |
2樓2013-11-12 10:45:02
zoe122208
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3樓2013-11-12 15:30:08
befair
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
zoe122208: 金幣+75, 翻譯EPI+1, ★★★★★最佳答案 2013-11-13 10:33:10
zoe122208: 金幣+75, 翻譯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. 不大通順，見諒 |
4樓2013-11-12 20:46:44
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