現實情(qing)況遠非想(xiang)的那么單(dan)純(chun)容(rong)易清(qing)晰：當優越感(gan)逐漸轉為失落感(gan)甚至(zhi)挫(cuo)敗感(gan)時，當由(you)堅信自己(ji)是(shi)塊“金子”到懷疑(yi)自己(ji)是(shi)粒“沙子”時，憤怒，迷茫，自卑，焦急，躁動(dong)就開(kai)始(shi)與日俱增。
套筒波紋管的綜合應力與其耐壓強度由尺度中給出的波紋管平面穩固性和周向穩固性的盤算要領和評定尺度可以看出，二者反應的均為強度題目。當波紋管計劃的許用壽命較低時，不但其子午向綜合應力較高，環向應力也比力高，使波紋管局部很快進入塑性變形，導致波紋管失穩。
對(dui)付內(nei)壓(ya)(ya)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)，位移(yi)應力在波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)波(bo)(bo)(bo)(bo)(bo)(bo)峰和(he)波(bo)(bo)(bo)(bo)(bo)(bo)谷處(chu)形(xing)成(cheng)塑(su)性鉸，再(zai)加上壓(ya)(ya)力應力，波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)很(hen)快產(chan)平(ping)(ping)生(sheng)面(mian)(mian)失穩(wen)(wen)。這便是低(di)委頓(dun)壽(shou)命(ming)(ming)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)在位移(yi)條(tiao)件下平(ping)(ping)面(mian)(mian)失穩(wen)(wen)壓(ya)(ya)力遠低(di)于(yu)(yu)高委頓(dun)壽(shou)命(ming)(ming)的(de)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)基礎(chu)緣故原由。比方在預變位狀(zhuang)(zhuang)態下，即波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)位移(yi)量(liang)為許(xu)(xu)用(yong)值的(de)1/2時(shi)，許(xu)(xu)用(yong)委頓(dun)壽(shou)命(ming)(ming)為200次的(de)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)，尚未到達(da)其容許(xu)(xu)計劃(hua)(hua)壓(ya)(ya)力時(shi)，已經產(chan)平(ping)(ping)生(sheng)面(mian)(mian)失穩(wen)(wen)；許(xu)(xu)用(yong)委頓(dun)壽(shou)命(ming)(ming)為1000次的(de)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)，到達(da)計劃(hua)(hua)壓(ya)(ya)力時(shi)，波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)處(chu)于(yu)(yu)平(ping)(ping)面(mian)(mian)穩(wen)(wen)固(gu)(gu)狀(zhuang)(zhuang)態，到達(da)1.5倍計劃(hua)(hua)壓(ya)(ya)力時(shi)，波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)處(chu)于(yu)(yu)臨界(jie)失穩(wen)(wen)狀(zhuang)(zhuang)態；許(xu)(xu)用(yong)委頓(dun)壽(shou)命(ming)(ming)為2000次的(de)波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)到達(da)計劃(hua)(hua)壓(ya)(ya)力1.5倍時(shi)，波(bo)(bo)(bo)(bo)(bo)(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)仍處(chu)于(yu)(yu)平(ping)(ping)面(mian)(mian)穩(wen)(wen)固(gu)(gu)狀(zhuang)(zhuang)態。
河(he)南(nan)中(zhong)(zhong)海(hai)建管道設備(bei)有限公司地(di)(di)(di)處(chu)中(zhong)(zhong)原腹(fu)地(di)(di)(di)河(he)南(nan)省，位(wei)于鄭州與(yu)九朝(chao)(chao)古(gu)都(dou)洛陽之(zhi)間，中(zhong)(zhong)西部的“百強縣”中(zhong)(zhong)原名城鞏義市境內，北臨黃河(he)，南(nan)依嵩岳,是(shi)唐朝(chao)(chao)詩圣杜甫之(zhi)故里。隴海(hai)鐵路(lu)、310國道、開-洛高速橫貫東(dong)西，地(di)(di)(di)理(li)位(wei)置優(you)越，交通(tong)便利，通(tong)訊發達(da)。
