3.89 ℃時，試樣會發(fā)生斷裂，與實測疲勞試樣的溫升值(3.68 ℃)相比，誤差為5.7 %；利用能量法提出了鎂合金疲勞壽命的計算公式，用能量法和傳統(tǒng)試驗方法分別繪制S-N曲線，結(jié)果具有很好的一致性，用2種方法分別計算了循環(huán)次數(shù)為1×107時的疲勞強度ΔσeΦ=99.3 MPa、ΔσeSN=99.8 MPa，誤差為0.5%。采用紅外熱像法估算疲勞壽命具有簡單、省時等優(yōu)勢。"/>

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基于紅外熱像法的AZ31B鎂合金疲勞壽命預(yù)測
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國家自然科學(xué)基金（51175364）；山西省自然科學(xué)基金（2013011014-3）


Prediction of AZ31B Magnesium Alloy Fatigue Life Based on Infrared Thermography
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    摘要:

    采用紅外熱像法測量AZ31B鎂合金板材在疲勞過程中表面溫度場的變化，結(jié)果表明，當(dāng)疲勞載荷大于疲勞強度時，鎂合金試樣表面的溫度變化經(jīng)歷5個階段：溫度上升階段、溫度下降階段、穩(wěn)定階段、斷裂前的溫升階段和斷裂后溫度下降階段。通過疲勞過程中鎂合金試樣表面的溫度變化規(guī)律，基于不同的理論提出了2種預(yù)測疲勞壽命的方法：由試驗過程中試樣表面溫升(?TM)特征確定其疲勞壽命，?TM–Nf曲線擬合結(jié)果表明，?TM=3.89 ℃為溫升極限值，即?TM>3.89 ℃時，試樣會發(fā)生斷裂，與實測疲勞試樣的溫升值(3.68 ℃)相比，誤差為5.7 %；利用能量法提出了鎂合金疲勞壽命的計算公式，用能量法和傳統(tǒng)試驗方法分別繪制S-N曲線，結(jié)果具有很好的一致性，用2種方法分別計算了循環(huán)次數(shù)為1×107時的疲勞強度ΔσeΦ=99.3 MPa、ΔσeSN=99.8 MPa，誤差為0.5%。采用紅外熱像法估算疲勞壽命具有簡單、省時等優(yōu)勢。

    Abstract:

    The surface temperature field change of AZ31B magnesium alloy was measured by infrared thermography during fatigue testing. Fatigue life of an extruded AZ31B alloy was predicted using different methods. Results show that the temperature evolution mainly undergoes five stages when the cycle loading is higher than the fatigue strength: temperature rising, the steep decrease, the constant value on temperature, abrupt temperature rise before specimen fracturing and final temperature drop. According to the temperature field change law, two methods were proposed to predict the fatigue life. The fatigue lives are obtained according to the temperature rise characteristics (?TM) in the course of fatigue test. The curve of ?TM-Nf shows that ?TM=3.89 oC is the maximum temperature increment, i.e. failure will occur when ?TM is more than 3.89 oC, and compared with the measured 3.68 oC, the error is smaller, 5.7%. Energy method is used to determine the fatigue life and draws the S-N curve. Fatigue strength is 99.3 MPa from the curve, and the error is 0.5 % compared with the measured result 99.8 MPa. The method of infrared thermography is convenient and time saving for evaluating the fatigue life of magnesium alloy.

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張紅霞,裴飛飛,閆志峰,王 凱,王文先,劉曉晴,吳廣賀,李詠梅.基于紅外熱像法的AZ31B鎂合金疲勞壽命預(yù)測[J].稀有金屬材料與工程,2014,43(10):2525~2529.[Zhang Hongxia, Pei Feifei, Yan Zhifeng, Wang Kai, Wang Wenxian, Liu Xiaoqing, Wu Guanghe, Li Yongmei. Prediction of AZ31B Magnesium Alloy Fatigue Life Based on Infrared Thermography[J]. Rare Metal Materials and Engineering,2014,43(10):2525~2529.]
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  • 收稿日期:2013-10-19
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  • 在線發(fā)布日期: 2015-04-07
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