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力學試驗中力強度的概述
力(li)(li)學試(shi)(shi)(shi)驗(yan)中力(li)(li)強(qiang)(qiang)度(du)的(de)概述 材料(liao)試(shi)(shi)(shi)驗(yan)機進行試(shi)(shi)(shi)驗(yan)的(de)過程中,常(chang)碰到一(yi)(yi)些(xie)的(de)名詞術語,使(shi)用(yong)材料(liao)試(shi)(shi)(shi)驗(yan)機使(shi)材料(liao)受(shou)外力(li)(li)時(shi)表現出來的(de)各種(zhong)力(li)(li)學性能的(de)各種(zhong)強(qiang)(qiang)度(du)術語整理如下: 1.抗(kang)彎(wan)(wan)強(qiang)(qiang)度(du)(bendingstrength): 抗(kang)彎(wan)(wan)強(qiang)(qiang)度(du)是(shi)指材料(liao)抵抗(kang)彎(wan)(wan)曲不斷(duan)裂的(de)能力(li)(li),主要用(yong)于考察陶(tao)瓷(ci)等脆性材料(liao)的(de)強(qiang)(qiang)度(du)。一(yi)(yi)般采萬(wan)能試(shi)(shi)(shi)驗(yan)機用(yong)三(san)(san)點抗(kang)彎(wan)(wan)測(ce)試(shi)(shi)(shi)或四點測(ce)試(shi)(shi)(shi)方法評測(ce)。其(qi)中四點測(ce)試(shi)(shi)(shi)要兩個(ge)加載力(li)(li),比較復雜;三(san)(san)點測(ce)試(shi)(shi)(shi)*常(chang)用(yong)。其(qi)值與承受(shou)
發布時間:2011-10-06 15:33
點(dian)擊次數:1698 次
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怎樣判斷拉力機質量的優略
有(you)些(xie)客戶在選擇拉力機,拉力試驗機的(de)時候往往只考慮價格因(yin)數,忽(hu)視了(le)(le)機器的(de)質(zhi)量(liang)(liang)(liang),這個世(shi)界上都是一分(fen)錢一分(fen)貨的(de)東西,希望這些(xie)客戶慎(shen)重考慮,作為一種(zhong)測試產(chan)(chan)品來說質(zhi)量(liang)(liang)(liang)很(hen)重要。 怎樣(yang)判(pan)斷拉力機質(zhi)量(liang)(liang)(liang)的(de)優略(lve)呢?我們(men)購買拉力機作用一是為了(le)(le)通過qs認證達到(dao)國(guo)家標準,能夠(gou)符合標準得(de)到(dao)正常(chang)生產(chan)(chan);二是為了(le)(le)檢測自己的(de)產(chan)(chan)品,提高產(chan)(chan)品的(de)質(zhi)量(liang)(liang)(liang),質(zhi)量(liang)(liang)(liang)合格才能夠(gou)進一步的(de)打開市(shi)場(chang)。目前市(shi)場(chang)上的(de)拉力機種(zhong)類(lei)繁多,價格也不一樣(yang),到(dao)底如(ru)何選擇吶(na)
發(fa)布時間:2011-10-06 14:38
點(dian)擊次數:1503 次
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恒溫恒濕試驗設備各系統的工作原理
恒(heng)溫恒(heng)濕(shi)試驗設備(bei)各(ge)系(xi)統(tong)(tong)(tong)的(de)工作(zuo)原理恒(heng)濕(shi)恒(heng)濕(shi)試驗機系(xi)統(tong)(tong)(tong)的(de)運作(zuo)是(shi)通(tong)過三個相互(hu)聯系(xi)的(de)系(xi)統(tong)(tong)(tong):制(zhi)(zhi)冷劑循環系(xi)統(tong)(tong)(tong)、電器自控系(xi)統(tong)(tong)(tong)、空(kong)氣(qi)循環系(xi)統(tong)(tong)(tong)。1、制(zhi)(zhi)冷劑循環系(xi)統(tong)(tong)(tong): 蒸發器中的(de)液(ye)(ye)態(tai)制(zhi)(zhi)冷劑吸收空(kong)氣(qi)的(de)熱量(liang)(空(kong)氣(qi)被降溫及除濕(shi))并(bing)開始(shi)蒸發,*終制(zhi)(zhi)冷劑與空(kong)之間(jian)形成一定(ding)的(de)溫度差,液(ye)(ye)態(tai)制(zhi)(zhi)冷劑亦完全蒸發變為氣(qi)態(tai),后被壓(ya)縮(suo)機吸入并(bing)壓(ya)縮(suo)(壓(ya)力和溫度增加),氣(qi)態(tai)制(zhi)(zhi)冷劑通(tong)過冷凝器(風冷/水冷)吸收熱量(liang),凝結成液(ye)(ye)體。通(tong)過膨(peng)脹(zhang)閥(或毛細(xi)管(guan)
發布時間:2011-08-22 10:02
點擊次(ci)數(shu):1540 次(ci)
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拉力試驗機測試皮革的抗張強度和伸長率的測定方法
拉(la)力試(shi)驗機測(ce)(ce)(ce)試(shi)皮革的抗張強度和(he)伸長(chang)率的測(ce)(ce)(ce)定(ding)(ding)(ding)方法: 1、原理 1.1抗張強度:試(shi)片(pian)在規定(ding)(ding)(ding)的溫(wen)度濕(shi)度的空氣中調節和(he)側厚(hou)(hou),并在拉(la)力試(shi)驗機中進行伸展(zhan)(zhan)直到斷(duan)裂為止(zhi)。1.2伸長(chang):將經過空氣調節的試(shi)片(pian)放在拉(la)力機中加(jia)力伸展(zhan)(zhan),當(dang)試(shi)片(pian)受力到預先指定(ding)(ding)(ding)值或斷(duan)裂時,試(shi)片(pian)神展(zhan)(zhan)的程度2、儀器2.1模刀:用以(yi)切割試(shi)片(pian)2.2厚(hou)(hou)度測(ce)(ce)(ce)定(ding)(ding)(ding)儀:按GB4689.4-84《皮革-物(wu)理性能測(ce)(ce)(ce)試(shi)-厚(hou)(hou)度的測(ce)(ce)(ce)定(ding)(ding)(ding)》的規定(ding)(ding)(ding)2.3萬能材料(liao)試(shi)驗機:夾
發布時間:2011-07-28 17:26
點擊次數:1889 次
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鹽霧測試機的種類及試驗步驟
鹽(yan)(yan)霧(wu)測試(shi)(shi)(shi)機的種類及(ji)試(shi)(shi)(shi)驗(yan)步(bu)驟1、鹽(yan)(yan)霧(wu)試(shi)(shi)(shi)驗(yan)簡述(shu):鹽(yan)(yan)霧(wu)試(shi)(shi)(shi)驗(yan)是一(yi)種主要利(li)用(yong)鹽(yan)(yan)霧(wu)試(shi)(shi)(shi)驗(yan)設(she)備所創造的人(ren)工(gong)模(mo)擬鹽(yan)(yan)霧(wu)環境條件來考核(he)(he)產(chan)品或金屬材料耐(nai)腐蝕性能(neng)的環境試(shi)(shi)(shi)驗(yan)。它分為(wei)二大類,一(yi)類為(wei)天然環境暴露試(shi)(shi)(shi)驗(yan),另一(yi)類為(wei)人(ren)工(gong)加速模(mo)擬鹽(yan)(yan)霧(wu)環境試(shi)(shi)(shi)驗(yan)。人(ren)工(gong)模(mo)擬鹽(yan)(yan)霧(wu)環境試(shi)(shi)(shi)驗(yan)是利(li)用(yong)一(yi)種具有(you)一(yi)定容積空間的試(shi)(shi)(shi)驗(yan)設(she)備——鹽(yan)(yan)霧(wu)試(shi)(shi)(shi)驗(yan)箱,在其(qi)容積空間內(nei)用(yong)人(ren)工(gong)的方法,造成鹽(yan)(yan)霧(wu)環境來對產(chan)品的耐(nai)鹽(yan)(yan)霧(wu)腐蝕性能(neng)質量進行考核(he)(he)。它與天
發布時間:2011-07-22 08:50
點擊(ji)次(ci)數:2061 次(ci)
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恒溫恒濕試驗機的工作原理
恒溫(wen)恒濕試(shi)驗(yan)(yan)機(ji)的(de)工(gong)作(zuo)(zuo)原(yuan)理: 恒溫(wen)恒測試(shi)驗(yan)(yan)機(ji)由制(zhi)冷系(xi)(xi)(xi)(xi)統(tong),加(jia)熱系(xi)(xi)(xi)(xi)統(tong),控制(zhi)系(xi)(xi)(xi)(xi)統(tong),濕度系(xi)(xi)(xi)(xi)統(tong),送風循環(huan)系(xi)(xi)(xi)(xi)統(tong),和(he)傳感器系(xi)(xi)(xi)(xi)統(tong)等(deng)組成,上(shang)述系(xi)(xi)(xi)(xi)統(tong)分屬(shu)電氣(qi)和(he)機(ji)械制(zhi)冷兩大(da)(da)方面。下面敘(xu)述幾(ji)個主(zhu)要(yao)(yao)系(xi)(xi)(xi)(xi)統(tong)的(de)工(gong)作(zuo)(zuo)原(yuan)理和(he)工(gong)作(zuo)(zuo)過程: 加(jia)熱系(xi)(xi)(xi)(xi)統(tong):加(jia)熱系(xi)(xi)(xi)(xi)統(tong)相對(dui)制(zhi)冷系(xi)(xi)(xi)(xi)統(tong)而言,是比較(jiao)(jiao)簡單(dan)。它主(zhu)要(yao)(yao)有(you)大(da)(da)功率電阻絲組成,由于試(shi)驗(yan)(yan)要(yao)(yao)求的(de)升(sheng)溫(wen)速(su)率較(jiao)(jiao)大(da)(da),因此加(jia)熱系(xi)(xi)(xi)(xi)統(tong)功率都比較(jiao)(jiao)大(da)(da),而且在試(shi)驗(yan)(yan)機(ji)的(de)底板(ban)也設(she)有(you)加(jia)熱器。 恒溫(wen)恒測試(shi)
發布(bu)時(shi)間:2011-06-27 09:34
點擊次(ci)數:1425 次(ci)