電子(zi)扭(niu)轉試(shi)(shi)(shi)驗機是(shi)檢測(ce)金屬線材的表(biao)(biao)面(mian)(mian)(mian)質量(liang),在扭(niu)力矩超(chao)過屈服點后,各點形(xing)(xing)變仍(reng)與其(qi)距軸心的距離成正(zheng)比。扭(niu)轉試(shi)(shi)(shi)驗檢測(ce)試(shi)(shi)(shi)樣從(cong)開始變形(xing)(xing)直至破壞,其(qi)表(biao)(biao)現為:試(shi)(shi)(shi)樣的長(chang)度和半(ban)徑(jing)保持(chi)不(bu)變,外(wai)觀仍(reng)保持(chi)圓(yuan)形(xing)(xing);塑性變形(xing)(xing)沿試(shi)(shi)(shi)樣的縱向或徑(jing)向由小至大連(lian)續分(fen)布;在試(shi)(shi)(shi)樣橫(heng)截面(mian)(mian)(mian)的表(biao)(biao)面(mian)(mian)(mian),變形(xing)(xing)均(jun)勻且相等。