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研究生:洪碩
研究生(外文):HONG, SHUO
論文名稱:汽車碟式剎車碟盤熱結構耦合分析
論文名稱(外文):Coupled Thermal and Structural Analysis ofAutomobile Brake Disc
指導教授:蔡建雄蔡建雄引用關係胡惠文
指導教授(外文):Tsai, Chien-HsiungHu, Hui-Wen
口試委員:蔡建雄胡惠文陳建成吳加恩許聖彥李石頓
口試委員(外文):Tsai, Chien-HsiungHu, Hui-WenChen, Jian-ChengWu, Jia-EnHsu, Sheng-YenLi, Shi-Dun
口試日期:2017-07-13
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:車輛工程系所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:74
中文關鍵詞:剎車系統實心碟煞車碟盤耦合
外文關鍵詞:Brake SystemSolid discBrake DiscCoupled-Field
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本研究利用ANSYS Workbench模擬剎車碟盤進行多次制動疲勞試驗的溫度分布及分析其對結構產生的影響之熱結構耦合分析,並探討現象生成原因;第一部分以碟盤圓周對稱簡化模型針對剎車系統於靜態5MPa油壓之夾持狀態下進行熱流模擬並與實驗比對溫度差異,並探討溫度生成的機制,第二部分以碟盤圓周對稱簡化模型,與多次制動機台試驗比對完成溫度結果匯入固力分析,並利用ANSYS針對灰鑄鐵壓縮及拉伸不對稱性質所專用的CAST IRON模組給定不同溫度下之拉伸以及壓縮曲線,完成多次制動的熱結構耦合分析,探討應力主要產生原因以及生成機制,第三部份針對九種不同的幾何設變模型,以單次制動條件進行分析並互相比對探討其溫度、應力、變形之差異。
熱流分析結果顯示對於溫度高低最敏感位置為盤面磨擦面中間,而插溝以及頸部的溫度現象來自於碟盤本身熱傳導,與盤面的溫度趨勢無關。
而碟盤主要的應力現象出現在碟盤插溝以及來令片摩擦面,應力生成原因是由於碟盤受熱時溫度上升產生熱膨脹,而溫度分佈會造成溫度差進而形成熱應力產生熱變形,最大應力出現於碟盤插溝處,由於摩擦面受熱時產生熱膨脹使得盤面呈現整體徑向外變形,而插溝位置的溫度不高,熱膨脹效應低,應力來源是盤面徑向的向外變形產生結構性的拉伸應力,且有塑性應變的現象發生,而摩擦面表面與碟盤肉厚會產生溫度差異現象造成摩擦面升溫時發生壓縮應力,冷卻完成時發生拉伸應力,而插槽及盤面的熱應力生成主因皆來自於熱變形時產生的徑向及週向應力所造成。
設變模型的單次制動比對結果指出碟盤厚度對於溫度影響較大,而主要應力發生位置於插溝,可藉由加寬插溝寬度以及改變插溝圓角改善,此外插溝形狀較平坦也可降低插溝應力的發生並使碟盤上較趨勢更平均。
The numerical method is utilized to study the couple-field thermal and structure of solid disc of thermal fatigue test. First, the index of the temperature comparison between the fatigue test and simulation is used to evaluate the temperature of solid disc. Secondly, time dependent temperature result was imported by the simulation of thermal fatigue, and cast iron modulus was utilized to given high temperature material properties to evaluate the thermal stress and deformation of solid disc and discuss possibly causes of the phenomenon. Thirdly, nine different types of the solid discs was calculated on the single braking test condition, and index of the temperature phenomenon, thermal stress, thermal deformation was discussed in this paper. It was found that the most sensitive position of temperature change is on the middle of friction surface of solid disc, and the phenomenon of temperature on the groove or neck has not related to the temperature increasing of friction surface and was caused by the conduction of solid disc. The stress was occurred on the groove and friction surface of the solid disc, the main reason of the stress caused was the heat dissipation difference in the disc body by the thermal expansion when the temperature raising of solid disc. The groove has plastic strain and was caused by tensile stress when the thermal deformation occurred, and the radial and tangential stress of the friction surface of the solid disc was occurred by the same reason. The nine prototypes was calculated on the single braking test, and was found that the disc thickness has more effect on the temperature, and the max. principal stress still occurred on the groove, it can be optimize by increasing the groove width or change the groove side fillet, besides that the flatter groove mid surface can reduce the stress occurred and flatter the tilted of brake disc.
摘要 I
ABSTRACT III
謝誌 V
目錄 VI
表目錄 VIII
圖目錄 IX
第1章 緒論 1
1.1前言 1
1.2文獻回顧 5
1.3全文概述 10
第2章 多次制動試驗溫度現象分析 11
2.1電腦輔助設計(CAD)模型 11
2.2電腦輔助工程(CAE)模型 13
2.3材料參數 14
2.4邊界條件 16
2.4.1多次制動疲勞試驗測試流程 17
2.4.2熱通量 19
2.4.3熱對流係數、熱輻射、固定溫度、絕熱 22
2.5多次制動溫度現象模擬結果 25
2.5.1多次制動分析與試驗溫度比對結果 26
2.5.2溫度分佈現象探討 27
2.5.2溫度分佈現象關係探討 30
第3章 多次制動試驗溫度耦合結構分析 34
3.1本章摘要 34
3.2 Cast Iron Material Model介紹 34
3.3材料參數 35
3.4邊界條件 37
3.5多次制動試驗溫度耦合結構分析結果 38
第4章 碟盤幾何參數變異靈敏度分析 53
4.1幾何樣式 53
4.2材料性質、邊界條件 54
4.3分析結果 56
第5章 結論 68
第6章 未來展望 71
參考文獻 72
作者簡介 74
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