本文選題：疲勞壽命　切入點(diǎn)：疲勞損傷　出處：《航空學(xué)報(bào)》2016年02期 　論文類型：期刊論文

【摘要】：通過(guò)對(duì)疲勞載荷譜損傷值的研究,發(fā)現(xiàn)金屬材料的疲勞壽命與疲勞試驗(yàn)載荷譜損傷值成線性關(guān)系,即金屬材料的疲勞壽命隨疲勞試驗(yàn)載荷譜的輕重成線性關(guān)系。由此規(guī)律推導(dǎo)出壽命系數(shù),通過(guò)壽命系數(shù)可以降低全尺構(gòu)件的疲勞試驗(yàn)時(shí)間。根據(jù)已有的疲勞試驗(yàn)數(shù)據(jù)研究的壽命系數(shù)值顯示,在平均譜(疲勞損傷值為50%)基礎(chǔ)上加重至58.33%損傷譜可降低全尺寸疲勞試驗(yàn)時(shí)間11%,75%損傷譜可降低36%,91.5%損傷譜可降低51%。由此得出:為了減少全尺疲勞試驗(yàn)時(shí)間,可以用加重載荷譜進(jìn)行全尺寸疲勞試驗(yàn),獲得重譜下的壽命,再利用樣件的壽命系數(shù)將其還原到平均譜下的平均壽命,然后用規(guī)范規(guī)定的疲勞分散系數(shù)除以平均壽命,給出使用壽命。這樣既實(shí)現(xiàn)了減少疲勞試驗(yàn)時(shí)間的目的,又不違背規(guī)范規(guī)定的疲勞分散數(shù)值,使飛機(jī)定壽既經(jīng)濟(jì)又可靠。
[Abstract]:By studying the damage value of fatigue load spectrum, it is found that the fatigue life of metal material is linearly related to the damage value of fatigue test load spectrum. That is, the fatigue life of metallic materials is linearly related to the fatigue test load spectrum. The fatigue test time of full-scale components can be reduced by life coefficient. On the basis of average spectrum (fatigue damage value is 50), adding to 58.33% damage spectrum can reduce the time of full-scale fatigue test by 11% or 75%. The damage spectrum can be reduced by 36% or 91.5%. It is concluded that in order to reduce the time of full-scale fatigue test, the damage spectrum can be reduced by 36% or 91.5%. The full-scale fatigue test can be carried out by using the weighted load spectrum, and the service life under the gravity spectrum can be obtained, and then the sample life coefficient can be reduced to the average life under the average spectrum, and then the fatigue dispersion coefficient specified in the specification may be divided by the average life span. The service life is given. In this way, the purpose of reducing the fatigue test time is achieved, and the fatigue dispersion value stipulated in the code is not violated, which makes the life determination of aircraft economical and reliable.
【作者單位】： 空軍裝備研究院航空裝備研究所;
【分類號(hào)】：V216.3

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