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src="/uploads/180330/1-1P330102135W2-lp.jpg" style="margin-right: 10px; float: left; width: 180px; height: 180px;" /></h3> <p> <span style="font-size:36px;"><a href="http://www.caoepaperfe.cn">彎管機(jī)</a>廠家對(duì)彎管機(jī)的設(shè)計(jì)和管子的受力計(jì)算</span></p> <p> <span style="font-size:20px;">根據(jù)“彈塑性力學(xué)”教科書(shū)上的知識(shí)。</span></p> <p> <span style="font-size:20px;">這是一個(gè)力矩平衡方程，左邊的是外力力矩，右邊的是內(nèi)力力矩，它等于應(yīng)力對(duì)中性軸產(chǎn)生的力矩的整個(gè)截面上的積分。彎曲時(shí)，管子的軸線就是中心軸。</span></p> <p> <span style="font-size:20px;">若圓管的外徑D、內(nèi)徑d，屈服極限OS，在曲率半徑為R的靠模上進(jìn)行彎管變形，因此，管子的內(nèi)圈半徑即為R。再設(shè)管子從發(fā)生彎曲變形的點(diǎn)到施力的點(diǎn)之距離為L(zhǎng)，材料無(wú)硬化，則發(fā)生彎管變形時(shí)，整個(gè)潔面均進(jìn)入塑性狀態(tài)。</span></p> <p> <span style="font-size:20px;">故：P*L=2*Integral{2*x*DY*OS*y,0,D/2}-2*Integral{2*x*DY*OS*y,0,d/2}</span></p> <p> <span style="font-size:20px;"> ={D^3-d^3}*OS/6</span></p> <p> <span style="font-size:20px;"> P={D^3-d^3}*OS/[6*L]</span></p> <p> <span style="font-size:20px;"> 這就是材料無(wú)硬化 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