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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Size effect and forming-limit strain prediction for microscale sheet metal forming of stainless steel 304
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Size effect and forming-limit strain prediction for microscale sheet metal forming of stainless steel 304

机译：不锈钢304的微型钣金成形的尺寸效应和成形极限应变预测

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摘要

Owing to the extensive applications of stainless steel 304 on a microscale, a series of microscale tensile and dome height tests were conducted to investigate its size effects on mechanical properties and formability. Based on the experimental results and observations and the Oh et al. fracture criterion, two new models were proposed in this paper for predicting the forming limit of stainless steel 304 foils in microscale sheet metal forming. For the mechanical properties study, foils of four thicknesses (150 μm, 100 μm, 50 μm, and 20 μm) heat treated at four temperatures (900 °C, 950 °C, 1000 °C, and 1050 °C) were used for the experiments. For the formability prediction, the first proposed model includes the effect of the strain path while the second proposed model considers the coupling effects of both the strain path and the size effects. The first model is superior to the Oh et al. criterion with respect to predicting the forming-limit strain of the foils, but it is not suitable for foils that are thinner than 100 μm. However, the second proposed model can be used for stainless steel 304 foils irrespective of their thicknesses and thickness-to-average-grain-size ratios T/D. It can also be concluded that the size effects must be considered in microformability when the foil thickness is smaller than 100 μm.
机译：由于不锈钢304在微观尺度上的广泛应用，进行了一系列微观尺度的拉伸和圆顶高度测试，以研究其尺寸对机械性能和可成型性的影响。根据实验结果和观察结果及Oh等。根据断裂准则，本文提出了两个新模型来预测不锈钢304箔在微型钣金成形中的成形极限。为了进行机械性能研究，使用了在四种温度（900°C，950°C，1000°C和1050°C）下热处理过的四种厚度（150μm，100μm，50μm和20μm）的箔实验。对于可成形性预测，第一个提出的模型包括应变路径的影响，而第二个提出的模型考虑应变路径和尺寸效应的耦合效应。第一个模型优于Oh等。关于预测箔片的成形极限应变的标准，但不适用于小于100μm的箔片。但是，第二种建议的模型可以用于不锈钢304箔，而与它们的厚度和厚度与平均粒度的比率T / D无关。还可以得出结论，当箔厚度小于100μm时，必须在微成形性中考虑尺寸效应。

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