全套高分子物理課件gwch07

1、彈彈 性性粘彈性粘彈性非線性粘彈性非線性粘彈性線性粘彈性線性粘彈性高彈性高彈性普彈性普彈性動(dòng)動(dòng) 態(tài)態(tài)靜靜 態(tài)態(tài)粘粘 性性Deformation形變性能形變性能ElasticityHigh elasticityViscosityviscoelasticityL i n e a r viscoelasticityStaticDynamicNon-Linear viscoelasticity應(yīng)力松弛應(yīng)力松弛蠕蠕 變變滯滯 后后力學(xué)損耗力學(xué)損耗斷裂性能斷裂性能韌韌 性性強(qiáng)強(qiáng) 度度FractureToughnessStrength,FFFF0l00lll lliildl0tgr 0VV0AFAF0AFs

2、00llAFE縱向單位寬度的增加橫向單向單位寬度的llmmtgAFrGs0VPVPB0ED1GJ1B127610cm達(dá)因2121110cm達(dá)因VTVTlSTluf,)()(VlVlPTVTPlVTTfTGlTGllS,)()()()(VlVTTfTluf,)()(fTf 77%33%11%4%固定拉伸時(shí)的張力溫度曲線固定拉伸時(shí)的張力溫度曲線f)(KTVTlu,)(VlTf,)(0TVlTSTf,)(dSTdSdQ 乙丙橡膠：CH2CH2CHCH2CH3CH2CHCH2CHC丙烯睛丙烯酸酯膠：CNOROCH2CH2SSSSOCH2OSiCH3CH3gTgTgTgTgTgTgTgTgTgTgTgT

3、gT形變形變時(shí)間時(shí)間交聯(lián)高聚物交聯(lián)高聚物理想彈性體理想彈性體理想粘性體理想粘性體線性高聚物線性高聚物Gt111G11t2tt22G)1 (22teG221tt2t3t3332t1ttteGGt321321)1 (3gTT 1gTT 21321gTT gTgTgTgTgTgTgT1PSF2聚苯醚聚苯醚3PC4改性聚苯醚改性聚苯醚5ABS（耐熱）（耐熱）6POM7尼龍尼龍8ABS2.01.51.00.5123456 （ ）78 小時(shí)小時(shí) 1000 200023時(shí)幾種高聚物蠕變性能時(shí)幾種高聚物蠕變性能tte0gTT gTT gT)(t)(t)(t)(t32gT回縮曲線回縮曲線拉伸曲線拉伸曲線)2si

4、n(sinsincoscossinsincos)cossinsin(cos)(00000ttttttt)sin()(0ttttsin)(0)()(ttG)()(*ttGGiGG *sincos*GGGG tgGG 損耗模量損耗模量損耗因子損耗因子儲(chǔ)能模量?jī)?chǔ)能模量tgGG loglog0loglogtgGG loglogG logtgloglogG1夾具夾具試樣試樣荷重荷重粘彈dtddtddtd粘彈彈彈 Edtd粘粘粘彈dtdEdtd1dtdEdtd1tg2121dtdE1 2 3 -2 -1 0 1 2 3 4 5 6 7 8 91T2T3T4T5T6T7T3TElog25-8000Talog

5、T)()(log21SSTTTCTTCa)(6 .51)(44.17logggTTTTTa6 .51,44.1721CCgT100ggTTT6 .101,86. 821CC50gT)(6 .101)(86. 8logssTTTTTa屈服應(yīng)變屈服應(yīng)變彈性彈性線性線性B（屈服點(diǎn)）（屈服點(diǎn)）C斷裂點(diǎn)斷裂點(diǎn)塑性塑性tg應(yīng)變速率對(duì)應(yīng)變速率對(duì)PMMA真應(yīng)力應(yīng)變曲線的影響真應(yīng)力應(yīng)變曲線的影響應(yīng)應(yīng)變變速速率率增增大大123410.2吋分吋分真應(yīng)變真應(yīng)變 41.28吋吋/分分31.13吋吋/分分20.8吋吋/分分真應(yīng)力真應(yīng)力gT溫度對(duì)醋酸纖維素應(yīng)力應(yīng)變曲線的影響溫度對(duì)醋酸纖維素應(yīng)力應(yīng)變曲線的影響應(yīng)力應(yīng)力應(yīng)變應(yīng)變806550250251.7千巴千巴1巴巴0.69千巴千巴3.2千巴千巴切應(yīng)力切應(yīng)力切應(yīng)變切應(yīng)變DE0 1 2 30 1 2 30 1 2 3由由 無(wú)法作無(wú)法作切線，不能成切線，不能成頸頸由由 可作兩可作兩條切線，有兩條切線，有兩個(gè)點(diǎn)滿足屈服個(gè)點(diǎn)滿足屈服條件，條件，D點(diǎn)時(shí)點(diǎn)時(shí)屈服點(diǎn)，屈服點(diǎn)，E點(diǎn)點(diǎn)開始