發(fā)布時間：2018-01-16 20:09

  本文關(guān)鍵詞：基于銅基摩擦材料盤式制動器溫度場與熱應(yīng)力耦合分析　出處：《哈爾濱理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 銅基摩擦材料 熱應(yīng)力耦合 盤式制動器 溫度場 應(yīng)力場

【摘要】：伴隨著高速列車的快速發(fā)展,其運營的安全性已經(jīng)成為影響高速列車發(fā)展的首要因素,因此制動系統(tǒng)性能的優(yōu)劣程度,已經(jīng)成為當(dāng)前影響高速列車發(fā)展的首要問題。現(xiàn)代對于高速列車盤式制動器的研究主要集中于制動盤溫度場和應(yīng)力場的分布情況,目前對于盤式制動器的失效形式主要是熱疲勞失效,盤式制動器的工作原理是一個直接的熱-結(jié)構(gòu)耦合的過程,會對整個制動器的震動,疲勞,噪聲有著巨大影響。因此采用熱-結(jié)構(gòu)直接耦合的方式對盤式制動器的溫度場和應(yīng)力場進(jìn)行系統(tǒng)分析,具有十分重大的意義。本文運用ANSYS有限元分析軟件,建立了三維有限元模型。研究了碳含量對銅基摩擦材料和結(jié)構(gòu)鋼為摩擦副的熱導(dǎo)率及溫度場和應(yīng)力場的影響。得出在初速度為160km/h,制動壓力為4MPa,碳含量20%,摩擦片熱導(dǎo)率為80W/(m·K),滑動摩擦副的溫度場的溫度梯度最小,等效應(yīng)力最小溫度值為125.41℃,產(chǎn)生的應(yīng)力值為2.72e5MPa。在選擇制動盤和摩擦塊時不宜選擇熱導(dǎo)率相差過大的材料,過度的降低摩擦片的熱導(dǎo)率會導(dǎo)致制動盤與摩擦片之間過大的溫度梯度,會引起嚴(yán)重的熱損傷,嚴(yán)重縮短制動器的使用壽命。研究了碳含量20%,摩擦片熱導(dǎo)率為80W/(m·K)時,制動壓力為0.6MPa,制動初速度和制動壓力兩種工況對盤式制動器的溫度場和應(yīng)力場的影響。選取制動初速度為制動壓力分別為0.6MPa和0.8MPa,研究表明,制動壓力對于制動器的溫度場和應(yīng)力場影響較小。選取制動速度為160km/h和300km/h對溫度場和應(yīng)力場進(jìn)行分析,制動速度為160km/h溫度場瞬時最高溫度為200.948℃,三向等效應(yīng)力為2.48e5MPa,制動速度為300km/h瞬時溫度高達(dá)513.78℃,三向等效應(yīng)力為3.04e6MPa,得出制動初速度是實際工況中對制動器溫度場和應(yīng)力場影響最大的因素。隨著初速的增加,制動器的溫度和應(yīng)力場均是先增大后減小的趨勢,并進(jìn)行實驗驗證得出與仿真結(jié)果相同的溫度曲線,驗證了仿真結(jié)果的正確性。
[Abstract]:With the rapid development of high-speed trains, the safety of their operation has become the primary factor affecting the development of high-speed trains, so the performance of the braking system is good and bad. The research on disc brake of high-speed train is mainly focused on the distribution of temperature field and stress field of brake disc. At present, the failure form of disc brake is mainly thermal fatigue failure. The working principle of disc brake is a direct thermal-structural coupling process, which will shake and fatigue the whole brake. The noise has a great influence. So the temperature field and stress field of disc brake are analyzed systematically by means of thermal-structure direct coupling. This paper uses ANSYS finite element analysis software. A three-dimensional finite element model was established to study the effect of carbon content on the thermal conductivity, temperature field and stress field of copper based friction materials and structural steel pairs. The initial velocity was 160 km / h. The brake pressure is 4 MPA, the carbon content is 20, the thermal conductivity of the friction plate is 80 W / m 路KN, the temperature gradient of the sliding friction pair is the minimum, the minimum temperature value of equivalent stress is 125.41 鈩，

本文編號：1434619