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woshisongyan鐵蟲 (小有名氣)
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[求助]
耐火材料彈性模量測試
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| 靜態(tài)法和動態(tài)法測試耐火材料的彈性模量,靜態(tài)法測到的數(shù)值偏小,動態(tài)法測到的數(shù)值偏大,怎么解釋呀? |
金蟲 (正式寫手)
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Static MOE is rate sensitive, and the loading rate should be given. Increasing the loading rate increases the apparent MOE, as inelastic processes are generally time-dependent, while elastic processes are time-independent.[20] The dynamic methods measure MOE at almost zero stress and are highly accurate. Indeed, near zero stress, the MOE measurement is a truly elastic process. The dynamic MOE represents purely elastic behavior incorporating the effect of microcracks and porosity, while the intrinsic Young's modulus of a material is based on theoretical density with no microcracks. Intrinsic Young's modulus varies only with respect to composition and temperature. Intrinsic Young's modulus cannot be measured for castables, but may be estimated by the mixture rule and the intrinsic Young's modulus of each phase making up the material.[20] http://www.ceramicindustry.com/a ... t-high-temperatures |

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