By Leonid A. Sosnovskiy, R.S. Sosnovskaya, K.V. Frolov, N.A. Makhutov
Fatigue and put on are the main destructive phenomena affecting machines considering they lead to a few ninety% of breakdowns. This instructional publication systematically develops a unified evaluation, named tribo-fatigue, which goals to deal with the complicated wear-fatigue damages. Tribo-fatigue synthesizes facets of 3 disciplines: mechanical fatigue, tribology, and reliability of mechanical structures. Tribo-fatigue opens new views for expanding the sturdiness of machines in keeping with an important standards in their serviceability. particular harm size and wear-fatigue exams that permit engineers to layout tougher and trustworthy structures are built. The ebook is meant for complex scholars, researchers and engineers.
Read or Download TRIBO-FATIGUE: Wear-Fatigue Damage and its Prediction (Foundations of Engineering Mechanics) PDF
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Extra info for TRIBO-FATIGUE: Wear-Fatigue Damage and its Prediction (Foundations of Engineering Mechanics)
Sample text
35. Primaryfatigue curve 1 duringregularloading (FI) and secondary fatigue curves 2 and 3 respectively during randomnarrow-strip (F2) and wide-strip (F3) random loading processes In case of block loading , a secondary fatigue curve is plotted similarly. 36 shows the primary and secondary fatigue curves for medium-carbon steel. The loading block had 12 stages and represented a histogram of distribution of stresses that could be approximated by the normal law. Curve 2 in Fig. 36 characterizes in this way the resistance to fatigue during normal distribution of amplitudes of stresses.
34), it is opposite in Eq. e. a/as s 1. Moreover, while it is always No s N Go in Eq . 34) , it is No ;::: 1 = Ns in Eq . 60) , where N s = 1 - the "durability" under effect of the stress equal to the true stress of rupture (assumed equal to unity). 60) is limited from above with the point having the coordinates (N s = 1, as). 7 The effect of various factors The value of the endurance limit as the main characteristic of resistance to fatigue depends on many factors : concentration of stresses, dimensions of objects undergoing tests, surface roughness, ambient temperature and many others .
21) Here the coefficient of proportionality is a certain function f of relations between principal stresses. 9), we establish : IV a equiv = (J in' . Thus, it turns out that stress intensity possesses energy content because the fourth (IV) (classic) theory of strength is based on the analysis of energy needed to change the shape of a deformable solid. 3 Deformation energy In the elastic state during simple tension of the specimen the deformation energy is rated by the work ofthe internal force at a corresponding displacement: 20 1 VOLUME FRACTURE AND SURFACE DAMAGE 1 1 2 2£ 2 u=-cre=-cr .
