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1.
聚丙烯腈纤维在水浴牵伸过程中应力-应变曲线的研究 总被引:1,自引:6,他引:1
主要考察了聚丙烯腈纤维在水浴牵伸过程中的应力—应变曲线,以及温度、牵伸速率、水分对应力—应变曲线的影响。结果表明:聚丙烯腈纤维在水温为室温(26℃)、30℃~70℃时属于细颈牵伸,在80℃、90℃时是类橡胶牵伸,当水温低于60℃和牵伸速率太快时纤维易产生毛丝。所以在牵伸过程中,水温不能低于60%,牵伸速率要适中,在本实验条件下,200mm/min、500mm/min比较合适,而且在水中牵伸比在空气中牵伸效果好,可获得较大的牵伸率。 相似文献
2.
J.E Nuñez 《Engineering Fracture Mechanics》2004,71(12):1791-1803
A method for the estimation of time-dependent strains and stresses induced in notches has been developed. The aim of the method is to generate a solution for the creep strain and stress at the notch root based on the linear-elastic stress state, the constitutive law, and the material creep model. The proposed solution is an extension of Neuber’s total strain energy density rule for the case of time-independent deformation. The method was derived for both localized and non-localized creep in a notched body. Predictions were compared with finite element data and good agreement was obtained for various geometrical and material configurations in plane stress conditions. 相似文献
3.
This research focuses on elucidating the present knowledge gaps in geopolymer concrete's engineering properties, specifically its stress-strain behaviour. Geopolymer concrete (GPC) is an emerging alternative to ordinary Portland cement concrete (OPCC), and is produced via a polycondensation reaction between aluminosilicate source materials and an alkaline solution. As a relatively new material, many engineering properties of geopolymer concrete are still undetermined. In this paper, the compressive strength, modulus of elasticity and stress-strain behaviour of ambient and heat-cured GPC and OPCC have been studied experimentally. A total of 195 geopolymer concrete cylinders and 210 Portland cement concrete cylinders were tested for the above mentioned characteristics. Based on the experimental results, constitutive models describing the complete stress–strain behaviour in uniaxial compression have been developed for the low-calcium fly ash-based geopolymer concrete and the heat-cured Portland cement concrete. 相似文献
4.
Based on the stick-slip process, an effective method to extract the stress-strain curve directly from the crosshead displacement-load raw data in compression of bulk metallic glasses was proposed.The method was tested in two bulk metallic glass samples with different plasticities and shear band morphologies.The extracted stress-strain curves were found to well resemble the stress-strain curve measured by a laser ex-tensometer.In addition, the extracted curve could resolve fine structures of serrated flow much better than that measured by extensometer, thus facilitating the study of shear banding process.Results obtained by this method made the stick-slip dynamics of shear banding valid, and this method could be employed to obtain the real strain of small-sized metallic glass samples where extensometer cannot be applied. 相似文献
5.
本文介绍了在节理岩体结构模型的基础上,运用有限元方法在计算机上模拟了节理岩体的三轴加载实验,计算出节理岩体的应力应变曲线,为进一步确定节理岩体的力学参数提供了基础。 相似文献
6.
The statement and solution algorithm are proposed for the problem on the stress-strain state of a kimberlite body, filling
massif, and enclosing rock during slice chamber mining with filling. The equations of nonlinear hereditary viscoelasticity
are used as the constitutive relations for saliferous rocks.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 26–37, May–June, 2005. 相似文献
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岩石变形和破裂的损伤模型 总被引:1,自引:0,他引:1
利用损伤力学的基本观点,以岩石中缺陷呈泊松分布,分析了岩石应力—应变全过程曲线的形成所得到的方程式,可以较好地描述全过程曲线,所需参数也容易实际测出。 相似文献
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