(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 哈爾濱 150001)
摘 要: 回彈是影響彎曲件精度的主要障礙，而彈性模量是影響回彈的重要因素之一。一般工程應(yīng)用中都把彈性模量作為常數(shù)，而實(shí)際上彈性模量隨塑性變形的進(jìn)展在不斷發(fā)生變化。為了準(zhǔn)確把握彈性模量值在塑性變形過程中的變化規(guī)律，針對(duì)應(yīng)用廣泛的鋁合金材料，采用靜力學(xué)實(shí)驗(yàn)方法，對(duì)常用的退火LY12及退火LF21鋁合金的彈性模量在塑性變形中的變化情況進(jìn)行了實(shí)驗(yàn)研究。得到了彈性模量值隨塑性變形程度及加載方式變化的規(guī)律，并分別歸納為數(shù)學(xué)模型。
關(guān)鍵字: 塑性變形；彈性模量；回彈；加載方式
modulus of aluminum alloy
（School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China）
Abstract:The forming precision of bent parts is dominated by springback, and springback is affected by elastic modulus of the material. Elastic modulus is usually treated as constant in engineering application. In fact, elastic modulus of the material is changing with plastic deformation of the blank in forming. The change of elastic modulus with plastic deformation was experimentally studied for LY12 and LF21 aluminum alloy respectively, and the law of change of elastic modulus with plastic deformation and loading path was attained, and mathematical models were also put forward.
Key words: plastic deformation；elastic modulus；springback；loading path
