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一、前言利用镦粗变形极限作为材料成形性的一项衡量指标是镦粗变形研究的一个重要方面。1968年,H.Kudo建议把圆柱体镦粗试验作为塑性成形材料抗裂性的一种评价手段。以后,镦粗实验方法不断得到改进,在圆柱体侧表面上印制网格,可以测量出表面应变。文献介绍的一种实验装置,能够实时测量出圆柱体鼓形侧面最大直径,从而能推算最大切向应变随压下量变化的规律。1982年,D.A.Dornfeld和E.Diei用声发射技术实时测量7075-T6铝合金在室温下的镦粗变形极限,一举改变了传统的目视俭测镦粗变形开裂的状况。
I. INTRODUCTION The use of upsetting deformation limits as a measure of material formability is an important aspect of upsetting deformation studies. In 1968, H. Kudo suggested cylinder upsetting as an evaluation of the crack resistance of plastic forming materials. Later, upsetting experimental methods continue to be improved, printed on the cylindrical surface of the grid, you can measure the surface strain. An experimental device introduced in the literature can measure the maximum diameter of the cylindrical side surface of a cylinder in real time so as to calculate the rule that the maximum tangential strain changes with the reduction of pressure. In 1982, D.A.Dornfeld and E.Diei using acoustic emission technology real-time measurement of 7075-T6 aluminum alloy upsetting deformation limit at room temperature, in one fell swoop changed the traditional visual inspection of upsetting deformation cracking situation.