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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >A prediction of bursting failure in tube hydroforming process based on plastic instability
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A prediction of bursting failure in tube hydroforming process based on plastic instability

机译：基于塑性不稳定性的管材液压成形工艺爆破失败预测

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摘要

Based on plastic instability, an analytical prediction of bursting failure on tube hydroforming processes under combined internal pressure and independent axial feeding is carried out. Bursting is an irrecoverable phenomenon due to local instability under excessive tensile stresses. In order to predict the bursting failure, three different classical necking criteria - diffuse necking criteria for a sheet, and a tube, and a local necking criterion for a sheet - are introduced. The incremental theory of plasticity for an anisotropic material is adopted and the hydroforming limit, as well as a diagram of bursting failure with respect to axial feeding and hydraulic pressure are presented. In addition, the influences of material properties such as anisotropy parameter, strain hardening exponent and strength coefficient on plastic instability and bursting pressure are investigated. As a result of the above approach, the hydroforming limit with respect to bursting failure is verified with experimental results.
机译：基于塑性不稳定性，对组合内压和独立轴向进给的管液压成形工艺的破裂失败进行了分析预测。由于过度拉伸应力下的局部不稳定性，破裂是无法恢复的现象。为了预测破裂失败，引入了三种不同的经典颈缩标准-薄板和管的扩散颈缩标准，以及薄板的局部颈缩标准-。采用了各向异性材料的可塑性增量理论，给出了液压成形极限，并给出了轴向进给和液压压力下的破裂破坏图。此外，还研究了各向异性参数，应变硬化指数和强度系数等材料性能对塑性不稳定性和破裂压力的影响。作为上述方法的结果，通过实验结果验证了关于破裂失败的液压成形极限。

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