<p style="margin-left:0pt; margin-right:0pt; text-align:left"><span style="font-size:12pt"><span style="background-color:#ffffff"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="background-color:#ffffff"><span style="font-family:Helvetica"><span style="color:#333333"><span style="font-family:Helvetica">弹簧扭转的时候材料是拉伸或者剪切状态比如谈到的扭转度计算，因此这个可扭转的角度限制最后是因为材料的失效而造成的，当材料发生塑性变形时无法恢复原来状态。因此最后归结为材料的抗拉强度跟抗剪强度，当然用第四强度理论计算得到的</span>Von Mises 应力为材料可承受的最大强度，结合弹簧的长度，便可以计算出最大允许扭转角度.</span></span></span></span></span></span></span></p>
<p style="margin-left:0pt; margin-right:0pt; text-align:left"><span style="font-size:12pt"><span style="background-color:#ffffff"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="background-color:#ffffff"><span style="font-family:Helvetica"><span style="color:#333333"><span style="font-family:Helvetica">扭簧的设计参数</span></span></span></span></span></span></span></span></p>
<p style="margin-left:0pt; margin-right:0pt; text-align:left"><span style="font-size:12pt"><span style="background-color:#ffffff"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="background-color:#ffffff"><span style="font-family:Helvetica"><span style="color:#333333"><span style="font-family:Helvetica">扭转弹簧（</span>Torsion Spring）乃变体弹簧之极至，由单扭簧至双扭簧异形扭簧，乃至各种扭杆之变形，得依设计成型。</span></span></span></span></span></span></span></p>
<p style="margin-left:0pt; margin-right:0pt; text-align:left"><span style="font-size:12pt"><span style="background-color:#ffffff"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="background-color:#ffffff"><span style="font-family:Helvetica"><span style="color:#333333"><span style="font-family:Helvetica">扭转弹簧（</span>Torsion Spring）为所有弹簧类别中设计原理较为复杂的一种，型式的变化亦相当活泼，故设计时所涉及的理论也最为烦索。因此设计时亦较难掌握</span></span></span></span></span></span></span></p>