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題 名 | Comparing Normal Distribution with Weibull Distribution on the Effect of the Reliability of Structural Components=比較常態分佈與Weibul分佈對結構元件可靠性之影響 |
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作 者 | 潘天賜; 廖惠娟; | 書刊名 | 建國學報 |
卷 期 | 20 2001.06[民90.06] |
頁 次 | 頁263-271 |
分類號 | 440.2 |
關鍵詞 | 可靠性; 常態分佈; weibull分佈; Reliability; Normal distribution; Weibull distribution; |
語 文 | 英文(English) |
中文摘要 | 大體來講,可靠性是考慮有關產品壽命。因此,我們須了解它們為何故障。使用時當受力超過元件的強度,負載元件將會故障。許多材料在不同的測試中,樣本會呈現顯著的強度差異,此乃眾所周知。鑑此,欲適度描述材料特性,必須應用機率法則,來分析強度測試結果。在此研究案中,受力與材料強度將皆被視為機率密度函數,而應力-強度干涉法則,則將被用於計算失敗的機率。結構元件之可靠性可藉應力-強度干涉法則來計算,換言之,此法則可用來計算強度超越應力時,對假設的應力分佈積分。預計本研究案必須為受力與材料強度,作一假設的頻率分佈。 此計劃的目的,是要測量應力-強度型態對假設的強度分佈之敏感度。為達此一目的,失敗積分機率將藉假設常態分佈負載,以及材料強度的常態分佈與Weibull分佈來發展。然後,本計劃將分析探討選擇強度分佈對失敗機率的影響。 |
英文摘要 | Reliability is generally concerned with failures during the life of a product. We therefore need to understand why item fail. A stressed item will fail only when the applied load exceeds the strength at the time of application. It is well known that many materials exhibit significant strength variation between test samples. Hence, to properly characterize material behavior, probabilistic methods which incorporate the scatter in strength testing must be used. In this paper, both the applied loading and the material strength are treated as probability density functions and the stress-strength interference theory is used to determine the probability of failure. This theory requires assuming a frequency distribution for both the applied stress (or applied loading) and the material strength. The objective of this study is to determine the sensitivity of the stress/strength interference model to the assumed form of strength distribution. To obtain this objective, probability of failure integrals were developed using the assumption of a normally distributed applied stress and normal and Weibull distributions for the material strength. The effect of the choice of strength distribution on the probability of failure is then analyzed and discussed. |
本系統中英文摘要資訊取自各篇刊載內容。