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  本文關(guān)鍵詞：車用木橡膠減震器動(dòng)態(tài)性能的理論分析與實(shí)驗(yàn)研究　出處：《東北林業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 木橡膠 動(dòng)態(tài)壓縮 應(yīng)力應(yīng)變 本構(gòu)方程 數(shù)值模擬

【摘要】：20世紀(jì)以來(lái),車用橡膠制品尤其是車用橡膠減震器的用量逐年上升,使得廢舊橡膠制品的產(chǎn)量不斷增加。廢舊橡膠對(duì)環(huán)境的污染非常嚴(yán)重,而且難以回收再利用。本文針對(duì)廢棄橡膠難以分解及再利用的弊端,在東北林業(yè)大學(xué)馬巖教授提出了“木橡膠”概念的基礎(chǔ)上,提出將木橡膠用于汽車減震器。木橡膠是由膠黏劑及微米級(jí)木絲模壓而成的復(fù)合材料,同時(shí)具有木材和橡膠的力學(xué)性能及材料特點(diǎn)。本文在研究了傳統(tǒng)的微米木絲模壓制品成型工藝后,制定了模壓車用木橡膠減震器的工藝過(guò)程,模壓出規(guī)格為φ25mm×32mm和φ8mm×8mm、拌膠量為40%、60%的車用木橡膠減震器試件。利用CMT5504電子萬(wàn)能實(shí)驗(yàn)機(jī)對(duì)車用木橡膠減震器試件進(jìn)行不同壓縮次數(shù)、不同壓縮速度的靜態(tài)壓縮實(shí)驗(yàn),利用Origin軟件對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行處理,得到相應(yīng)的應(yīng)力-應(yīng)變曲線以及吸能效率曲線。通過(guò)觀察得到的曲線對(duì)比分析兩種拌膠量車用木橡膠減震器的靜態(tài)特性及吸能性。為了對(duì)比兩種拌膠量的車用木橡膠減震器及已經(jīng)廣泛應(yīng)用于減震的氯丁膠減震器的動(dòng)態(tài)力學(xué)性能,本文選用分離式霍普金森壓桿在室溫下對(duì)三種試件進(jìn)行動(dòng)態(tài)壓縮實(shí)驗(yàn),實(shí)驗(yàn)應(yīng)變速率為1500s-1,2000s-1,2500s-1,3000s-1.利用Origin和Matlab軟件對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行處理,得到三種試件在四種應(yīng)變率下的應(yīng)力-應(yīng)變曲線。通過(guò)對(duì)比獲得的應(yīng)力-應(yīng)變曲線,分析三種試件的動(dòng)態(tài)力學(xué)性能。對(duì)拌膠量為40%的車用木橡膠減震器試件進(jìn)行宏觀及微觀觀察,分析試件的破壞形式。本文選用Johnson-Cook型本構(gòu)方程來(lái)描述車用木橡膠減震器的本構(gòu)關(guān)系,根據(jù)實(shí)驗(yàn)獲得的車用木橡膠減震器試件的靜、動(dòng)態(tài)力學(xué)實(shí)驗(yàn)數(shù)據(jù),分別求得了兩種拌膠量車用木橡膠減震器的Johnson-Cook型本構(gòu)方程。對(duì)比實(shí)驗(yàn)曲線與Johnson-Cook型本構(gòu)方程模擬曲線的吻合程度判斷Johnson-Cook型本構(gòu)方程對(duì)車用木橡膠減震器本構(gòu)關(guān)系的描述是否準(zhǔn)確。最后利用Ansys/Ls-dyna程序?qū)囉媚鞠鹉z減震器的動(dòng)態(tài)壓縮實(shí)驗(yàn)進(jìn)行模擬,通過(guò)觀察該模擬獲得的應(yīng)力-應(yīng)變曲線和SHPB實(shí)驗(yàn)實(shí)際獲得的應(yīng)力-應(yīng)變曲線的吻合程度,研究Ansys/Ls-dyna程序?qū)囉媚鞠鹉z減震器SHPB實(shí)驗(yàn)進(jìn)行模擬是否可行。本論文重點(diǎn)研究了車用木橡膠減震器的動(dòng)態(tài)力學(xué)性能,求得了車用木橡膠減震器的Johnson-Cook型本構(gòu)方程,為車用木橡膠減震器的應(yīng)用奠定了一定的理論基礎(chǔ)。
[Abstract]:Since twentieth Century, automotive rubber products especially for vehicle shock absorber rubber increased, so that the waste rubber yield increasing. Environmental pollution of waste rubber is very serious, and difficult to recycle. The waste rubber is difficult to decompose and reuse problems, put forward "at Northeast Forestry University Professor Ma Yan based on the concept of rubber wood, the wood rubber for automobile shock absorber. Rubber is a composite material consisting of wood adhesive and Micron Wood fiber molded material, mechanical properties and material characteristics of both wood and rubber. Based on the research of the micro forming process of traditional wood molding products, developed molded car in the process of wood rubber damper, mould the specifications for 25mm x 32mm and 8mm x Phi 8mm, glue mixing amount is 40%, 60% car specimens with wood rubber damper. By CMT5504 Zi Wanneng Test machine for vehicle shock absorber rubber wood specimens with different compression times, static compression experiment of different compression speed, the experimental data were processed by Origin software, get the corresponding stress-strain curves and energy absorption efficiency curve. By observing the curves obtained and analyzed two kinds of glue car with static characteristics wood rubber damper and energy absorption. In order to compare the two kinds of mixed glue car chloroprene rubber shock absorber for wood and rubber damper has been widely used in damping dynamic mechanical properties, the split Hopkinson pressure bar at room temperature for three kinds of specimens are dynamic compression experiment, experimental strain the rate of 1500s-12000s-12500s-13000s-1. for processing the experimental data by using Origin and Matlab software, three kinds of specimens in four kinds of strain rate stress-strain curves are obtained. By comparing the stress-strain curves obtained, Analysis of the dynamic mechanical properties of three kinds of specimens. The glue mixing volume of 40% cars with a wooden rubber shock absorber macroscopic and microscopic observation of the specimen, analysis the failure mode of the specimens. This paper use Johnson-Cook constitutive equation to describe the car with wood constitutive relations of rubber damper, according to the obtained vehicle wood rubber damper specimen of the static, dynamic mechanical experiment data were obtained, two cars with Johnson-Cook glue mixing type wood rubber damper constitutive equation. Experimental curves and Johnson-Cook constitutive equation simulation curve agree to determine the extent of Johnson-Cook type constitutive equation of the vehicle shock absorber rubber wood constitutive description is accurate. At the end of the vehicle dynamic wood rubber damper compression experiments were simulated using the Ansys/Ls-dyna program, the actual stress obtained by observing the simulated stress-strain curve and the experimental SHPB - With the degree of strain curve, Ansys/Ls-dyna program research on vehicle wood rubber damper SHPB experiment simulation is feasible. This paper focuses on the study of vehicle dynamic mechanical properties of wood rubber damper, the car is obtained with Johnson-Cook type wood rubber damper constitutive equation, and lay a theoretical foundation for vehicle application wood rubber shock absorber.

【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U463.335.1

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