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排序方式: 共有191条查询结果,搜索用时 31 毫秒
1.
A. A. Man’kov Yu. V. Krasovitskii E. V. Arkhangel’skaya S. L. Kabargin D. B. Troshchenko N. N. Lobacheva V. P. Dobrosotskii 《Refractories and Industrial Ceramics》2008,49(3):225-228
Methods are proposed for designing interpolation models for the preliminary determination and subsequent forecasting of general
and fractional breakthrough coefficients for dust used with granular filters, as employed in energy-saving and high-performance
dust trapping from technological gases and ventilation discharges in refractory production. The models are supplied with nomograms,
which makes them widely suitable for experts working in environmental protection at refractory-producing organizations. The
main factors are identified that influence the performance. The results are of interest to experts in related areas of industry
such as building materials and engineering ceramics and so on.
Translated from Novye Ogneupory, No. 4, pp. 64–67, April, 2008. 相似文献
2.
V. T. Troshchenko P. V. Yasnii V. V. Pokrovskii V. Yu. Podkol'zin 《Strength of Materials》1990,22(2):164-171
The previously proposed model of unstable fatigue crack growth is used to explain a large (in comparison with other mechanical characteristics) scatter of static fracture toughness for 15Kh2MFA and 15Kh2NMFA steels at temperatures below the tactile-brittle transition temperature. The results show that for the materials for which Kfc
1 < KIc the critical stress intensity factor KIc depends on the specific energy of inelastic strain W at the tip of the initial fatigue crack in its formation stage. The value of W is a function of the number of load cycles (in the conditions with a constant range of the stress intensity factor K) as a result of irregular fatigue crack growth. Here Kfc
1 is the minimum cyclic fracture toughness. A method is proposed of evaluating the minimum fracture toughness of the material in static loading based on inspection of the process of irregular fatigue crack growth in the stage of crack initiation.Translated from Problemy Prochnosti, No. 2, pp. 10–16, February, 1990. 相似文献
3.
V. T. Troshchenko P. V. Yasnii V. V. Pokrovskii B. T. Timofeev V. A. Fedorova 《Strength of Materials》1988,20(12):1552-1558
1. | Prestraining has an ambiguous effects on the FCG rate in steels 15Kh1MFA (I) and 15Kh2MFA (II). With increase in prestraining there is a decrease in the FCG rate in the threshold region of the KDFF of steel 15Kh2MFA (I) and also in the middle section for steel 15Kh2MFA (II). However, in the threshold region of the KDFF of steel 15Kh2MFA (II) FCG increases. |
2. | An increase in the level of prestraining for steels 15Kh2MFA (I) and 15Kh2MFA (II) leads to an increase of the SIF during opening of the crack. Due to this, the KDFF of these steels when plotted in the coordinates log V–log Keff is invariant relative to the degree of prestraining. |
4.
1. | Single plastic prestraining leads to a decrease of the threshold level of the stress intensity factor range of alloys if they do not form pores or microcracks during deformation. These structural defects cause stress relaxation or crack tip blunting which causes an increase in the threshold level of the SIF. |
2. | A material classification is presented which is based on sensitivity of FCG rate in the middle section of the kinetic diagram of fatigue failure to the degree of prestraining Cold deformation, rolling, or tensile tension increases the FCG rate of cyclic hardened materials (u/0.2>1.5) and decreases it for cyclic softened or cyclic stable materials. |
5.
V. T. Troshchenko 《Strength of Materials》2006,38(1):1-19
The paper considers methods of accelerated determination of endurance limits of metals and alloys based on the analysis of
regularities in their inelastic deformation, strain and energy criteria of fatigue fracture, and methods for life prediction
with the use of those criteria.
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Translated from Problemy Prochnosti, No. 1, pp. 5–31, January–February, 2006. 相似文献
6.
V. T. Troshchenko 《Strength of Materials》2005,37(5):443-459
The paper considers interrelation between the regularities in the fatigue fracture and inelastic deformation taking into account
the material properties, stress gradient and concentration, specimen size, load cycle asymmetry, complex stress state, temperature,
loading frequency and conditions, scatter of the test results. Analysis of the data from the literature and results of original
investigations has shown that the characteristics of inelasticity, which define nonlocalized fatigue damage, can be used in
studies of general regularities of the high-cycle fatigue fracture. Specific results of such analysis are presented.
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Translated from Problemy Prochnosti, No. 5, pp. 5 – 29, September – October, 2005. 相似文献
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