一個(ge)(ge)(ge)電(dian)(dian)子(zi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)殼內裝有(you)兩(liang)個(ge)(ge)(ge)以上電(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)系(xi)統，復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，每個(ge)(ge)(ge)電(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)系(xi)統各自獨(du)立通過電(dian)(dian)子(zi)流，實(shi)現各自的(de)(de)功(gong)(gong)能，這種電(dian)(dian)子(zi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)稱為(wei)(wei)(wei)復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)(guan)是指(zhi)用兩(liang)只或多只三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)按(an)一定規(gui)律進行組合，等(deng)效(xiao)成一只三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)(guan)又稱達(da)林(lin)頓(dun)(dun)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。具(ju)體接法(fa)如下，以兩(liang)個(ge)(ge)(ge)相同極(ji)(ji)(ji)(ji)(ji)(ji)(ji)性(xing)的(de)(de)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)為(wei)(wei)(wei)例，前(qian)(qian)面(mian)(mian)(mian)(mian)為(wei)(wei)(wei)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)集電(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)跟(gen)(gen)后面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)集電(dian)(dian)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)相接，前(qian)(qian)面(mian)(mian)(mian)(mian)為(wei)(wei)(wei)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)射(she)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)跟(gen)(gen)后面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)基極(ji)(ji)(ji)(ji)(ji)(ji)(ji)相接，前(qian)(qian)面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)功(gong)(gong)率一般(ban)比后面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)小，前(qian)(qian)面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)基極(ji)(ji)(ji)(ji)(ji)(ji)(ji)為(wei)(wei)(wei)達(da)林(lin)頓(dun)(dun)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)基極(ji)(ji)(ji)(ji)(ji)(ji)(ji)，后面(mian)(mian)(mian)(mian)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)射(she)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)為(wei)(wei)(wei)達(da)林(lin)頓(dun)(dun)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)射(she)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)，雙(shuang)金屬復(fu)合管(guan)(guan)(guan)(guan)(guan)(guan)(guan)廠家(jia)，用法(fa)跟(gen)(gen)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)一樣，放大(da)倍(bei)數是兩(liang)個(ge)(ge)(ge)三極(ji)(ji)(ji)(ji)(ji)(ji)(ji)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)放大(da)倍(bei)數的(de)(de)乘積(ji)。

無縫鋼管抗彎強度

抗彎(wan)強度(du) ? σbb ? MPa ? 試(shi)(shi)樣(yang)(yang)在位于兩(liang)支(zhi)承(cheng)中(zhong)間(jian)的集(ji)中(zhong)負荷作(zuo)用下，使(shi)其折斷時，折斷截(jie)(jie)面(mian)所(suo)承(cheng)受的較大正壓力(li)　8PL對圓試(shi)(shi)樣(yang)(yang)：σbb=——　πd　 　8PL對矩(ju)形(xing)試(shi)(shi)樣(yang)(yang)：σbb=——　 2bh式中(zhong) P——試(shi)(shi)樣(yang)(yang)所(suo)承(cheng)受較大集(ji)中(zhong)載荷（N）　 L——兩(liang)支(zhi)承(cheng)點間(jian)的跨距(mm)　d——圓試(shi)(shi)樣(yang)(yang)截(jie)(jie)面(mian)之(zhi)外徑(jing)(mm)　b——矩(ju)形(xing)截(jie)(jie)面(mian)試(shi)(shi)樣(yang)(yang)之(zhi)寬度(du)(mm)　h——矩(ju)形(xing)截(jie)(jie)面(mian)試(shi)(shi)樣(yang)(yang)之(zhi)寬度(du)(mm)

國內雙金(jin)屬復合管的(de)發(fa)展建(jian)議

加緊(jin)制(zhi)(zhi)造(zao)(zao)技(ji)(ji)術(shu)研發(fa)和(he)自動(dong)化(hua)程度。國內盡(jin)管(guan)有(you)眾多雙金(jin)屬(shu)復(fu)(fu)(fu)合管(guan)制(zhi)(zhi)造(zao)(zao)企(qi)業， 單位(wei)不(bu)(bu)同制(zhi)(zhi)造(zao)(zao)技(ji)(ji)術(shu)也(ye)不(bu)(bu)同， 但各單位(wei)的(de)技(ji)(ji)術(shu)水平(ping)卻參差不(bu)(bu)齊， 真正(zheng)能夠滿足用戶需要(yao)的(de)制(zhi)(zhi)造(zao)(zao)企(qi)業不(bu)(bu)超過兩個。普(pu)遍(bian)因(yin)技(ji)(ji)術(shu)不(bu)(bu)成熟， 規模小， 生產效率低(di)而 不(bu)(bu)能滿足社會需要(yao)。因(yin)此，旋壓復(fu)(fu)(fu)合管(guan)機器，行業內各單位(wei)應加緊(jin)復(fu)(fu)(fu)合管(guan)制(zhi)(zhi)造(zao)(zao)技(ji)(ji)術(shu)的(de)研發(fa)， 提(ti)(ti)高(gao)制(zhi)(zhi)造(zao)(zao)的(de)自動(dong)化(hua)程度， 促進(jin)復(fu)(fu)(fu)合管(guan)生產效率的(de)提(ti)(ti)高(gao)、質(zhi)量(liang)的(de)完善和(he)行業的(de)快(kuai)速健(jian)康(kang)發(fa)展。