【摘要】：對鈦合金同種TA1-TA1(TT)及異種TA1-Al5052(TA),TA1-H62(TH)自沖鉚接頭進(jìn)行疲勞試驗(yàn),用掃描電子顯微鏡對斷口及微動區(qū)進(jìn)行觀測研究其微動磨損機(jī)理,并研究下板強(qiáng)度對接頭疲勞壽命和失效形式的影響.結(jié)果表明,斷口裂紋萌生區(qū)即為微動磨損區(qū).微動磨損導(dǎo)致微動區(qū)亞表面產(chǎn)生微裂紋并逐步擴(kuò)展為宏觀疲勞裂紋導(dǎo)致接頭最終失效;微動磨屑在微動磨損過程中主要起減輕磨損作用.總體上TT接頭具有最優(yōu)疲勞性能,疲勞載荷較高時TA接頭疲勞性能優(yōu)異,疲勞載荷較低時TH接頭疲勞性能優(yōu)異.兩板強(qiáng)度相當(dāng)且疲勞載荷較高時失效形式主要為鉚釘斷裂,疲勞載荷較低時失效形式主要為下板斷裂;而下板強(qiáng)度與上板強(qiáng)度相差較大時,疲勞失效形式為下板斷裂.
[Abstract]:The fatigue test of titanium alloy TA1-TA1 (TT) and dissimilar TA1-Al5052 (TA), TA1-H62 (TH) self-punching riveting joints was carried out. The fretting wear mechanism of fracture surface and fretting zone was observed and studied by scanning electron microscope (SEM). The effect of lower plate strength on fatigue life and failure form of joint is also studied. The results show that the fracture crack initiation zone is fretting wear zone. Fretting wear leads to microcracks on the subsurface of fretting zone and gradually propagates into macroscopic fatigue cracks, which leads to the final failure of joints, and fretting debris mainly plays an important role in reducing wear in the process of fretting wear. Generally speaking, the TT joint has the optimal fatigue performance. The TA joint has excellent fatigue performance when the fatigue load is high, and the TH joint has excellent fatigue performance when the fatigue load is low. When the strength of the two plates is the same and the fatigue load is high, the failure form is mainly rivet fracture, and when the fatigue load is low, the failure form is mainly the lower plate fracture, while when the lower plate strength is quite different from the upper plate strength, the fatigue failure form is the lower plate fracture.
【作者單位】： 昆明理工大學(xué)創(chuàng)新制造技術(shù)研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目(51565022;51565023) 國家留學(xué)基金委(201500090194) 2015年云南省博士研究生學(xué)術(shù)新人基金
【分類號】：TG146.23;TH131.1

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