發(fā)布時間：2018-04-22 22:23

  本文選題：壓磁效應(yīng) + 鋼筋疲勞損傷��； 參考：《浙江大學(xué)學(xué)報(工學(xué)版)》2017年09期

【摘要】：對17個HRB400熱軋鋼筋加工的標(biāo)準試件進行軸向拉伸疲勞試驗,并通過實時記錄試件周圍的壓磁信號,研究疲勞過程中壓磁信號的演變規(guī)律.結(jié)果表明:HRB400鋼筋的壓磁信號對疲勞損傷很敏感,相比應(yīng)力-應(yīng)變滯回曲線更能反映疲勞損傷過程;在靜力加載與循環(huán)加載過程中,壓磁信號曲線都存在一個相對穩(wěn)定的極值比;不同疲勞階段的壓磁滯回曲線存在顯著差別,根據(jù)滯回曲線極值點的變化可預(yù)測疲勞失效;比較2個磁探頭信號的曲線特征可初步判斷失效的位置;試驗得到的壓磁信號演化過程符合疲勞三階段規(guī)律,據(jù)此提出一個預(yù)測鋼筋剩余疲勞壽命的方法.
[Abstract]:Axial tensile fatigue tests were carried out on 17 standard specimens processed by HRB400 hot rolled steel bar. The evolution of piezomagnetic signals during fatigue was studied by recording the piezomagnetic signals around the specimens in real time. The results show that the piezomagnetic signal of the rebar is sensitive to fatigue damage and can reflect the fatigue damage process better than the stress-strain hysteretic curve, and that there is a relatively stable extreme value ratio in the piezomagnetic signal curve during static loading and cyclic loading. There are significant differences in the hysteresis curves in different fatigue stages. Fatigue failure can be predicted according to the change of the extreme point of hysteresis curve, and the location of failure can be preliminarily judged by comparing the curve characteristics of two magnetic probe signals. The evolution process of the ferromagnetic signals obtained from the test accords with the three-stage fatigue law, and a method for predicting the residual fatigue life of steel bars is proposed.
【作者單位】： 浙江大學(xué)結(jié)構(gòu)工程研究所;浙江大學(xué)寧波理工學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51278459,51638013) 寧波市科技創(chuàng)新團隊資助項目(2011B81005)
【分類號】：TU375

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本文編號：1789207