εθlim=A[a·Δεθ/Δr+b·Δεθ/Δt]+c ;where εθlim represents the stretch flange limit strain (tangential direction of the sheet edge), Δεθ/Δr represents the strain gradient in the inward direction, Δεθ/Δt represents the strain gradient in the sheet thickness direction, A, a, and b represent influence coefficients, and c represents the limit strain at a time the strain gradient is zero."/>
METHOD FOR SPECIFYING STRETCH FLANGE LIMIT STRAIN AND METHOD FOR DETERMINING FEASIBILITY OF PRESS FORMING
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METHOD FOR SPECIFYING STRETCH FLANGE LIMIT STRAIN AND METHOD FOR DETERMINING FEASIBILITY OF PRESS FORMING
METHOD FOR SPECIFYING STRETCH FLANGE LIMIT STRAIN AND METHOD FOR DETERMINING FEASIBILITY OF PRESS FORMING
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机译：拉伸凸缘极限应变的确定方法和压制成形的可行性确定方法
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摘要
A method for specifying stretch flange limit strain includes specifying stretch flange limit strain so as to satisfy a relation in the following formula by using: strain gradient in an inward direction directed from an end portion of a metal sheet at a time a press load is applied; and strain gradient in a sheet thickness direction of the metal sheet intersecting the loading direction:; εθlim=A[a·Δεθ/Δr+b·Δεθ/Δt]+c ;where εθlim represents the stretch flange limit strain (tangential direction of the sheet edge), Δεθ/Δr represents the strain gradient in the inward direction, Δεθ/Δt represents the strain gradient in the sheet thickness direction, A, a, and b represent influence coefficients, and c represents the limit strain at a time the strain gradient is zero.
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机译：确定拉伸凸缘极限应变的方法包括通过使用以下条件来指定拉伸凸缘极限应变，以便满足下式中的关系：在施加压力时从金属板的端部指向的向内的应变梯度;在金属板的厚度方向上与加载方向相交的应变梯度： <？in-line-formulae description =“在线公式” end =“ lead”？>εθlim = A [a·Δε θ /Δr+ b·Δε θ /Δt] + c <？in-line-formulae description =“在线表达式” end =“ tail”？> ;;其中εθlim表示拉伸凸缘极限应变（片材边缘的切线方向），Δεθ /Δr表示应力梯度。向内方向，Δεθ /Δt表示板厚方向的应变梯度，A，a，b表示影响系数，c表示应变梯度为零时的极限应变。
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