共查询到19条相似文献，搜索用时 203 毫秒
1.
周单 《中国石油大学胜利学院学报》2023,(2):1-7
基于Biot理论和White斑状饱和模型,首先构建黏弹性孔隙介质模型,并推导出弹性参数与岩石属性之间的理论关系;然后通过3种含气砂岩储层模型,模拟地震波入射黏弹性孔隙介质反射界面处振幅随频率和入射角的响应变化,研究黏声以及黏弹性介质反射界面处精确的反射及透射系数随入射角和频率变化的关系,分析地震波在黏弹性孔隙介质中传播特征,研究地震波在传播时振幅随入射角和频率变化的理论响应关系;最后针对裂缝型储层,通过不同裂缝柔度的模拟,分析裂缝发育对反射系数产生的影响,以及弹性各向异性和频散的双重作用下地震响应特征。 相似文献
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双相材料平面的弹性力学基本解 总被引：1，自引：0，他引：1
采用Ａｉｒｙ应用函数法,对双相材料平面的弹性力学基本解进行了系统分析,获得了单位集中力作用下内任一点用显式表达的应力场和位移场,这一解答可方便地应用于双相材料的边界单元法的研究,也为我们使用与研究均质弹性平面内裂纹问题以及无限半平面的裂纹问题相同教研室上材料平面裂纹问题奠定了基础。 相似文献
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以ANSYS通用有限元为手段,使用非线性分析方法,对纤维缠绕复合材料压力容器进行有限元分析,在此模型基础上进一步研究了压力容器的渐进损伤,以失效因子为参数,讨论了失效单元逐层失效的过程。结果表明,复合材料压力容器在2.0MPa时树脂完全开裂,最初纤维断裂出现在应力为8.1MPa的桶身与封头连接处,而后经向纤维逐渐断裂,此位置最终在8.9MPa下纤维全部断裂。 相似文献
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轴对称压力容器弹塑性与强度分析 总被引：1，自引：0，他引：1
本文应用第一、第三强度理论对轴对称压力容器圆筒和半圆球部分进行弹塑性力学分析,得到各自弹性和塑性极限应力,将其与压力容器规范中径分析结果作对比分析。此外,本文还分析了径比对压力容器结构设计和强度的影响。 相似文献
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针对《高分子物理》课程中黏弹现象难于理解,作者根据教学经验对聚合物的黏弹性进行解析,通过理论联系实际,让学生加深对黏弹现象的理解,对于提高学生对课程的整体认识,强化学生对课程的理解,取得了良好的教学效果。 相似文献
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朱锡雄 《宁波大学学报(教育科学版)》1989,(1)
本文在内参量热力学的理论框架内详细讨论了线弹性裂纹体的裂纹扩展问题。对线弹性断裂力学中所涉及到的各种能量关系作了统一的整理,其中包括Irwin的弹性能释放率——裂纹扩展力,Griffith的脆性断裂准则,以及Irwin-Kies的柔度公式和Paris的位移公式。本文以中心裂纹体为例,详细计算了裂纹扩展的稳定性,并区分恒载荷和恒位移两种情况,对材料断裂韧性测试中所遇到的失稳扩展,稳定扩展以及进发现象提供了理论说明。 相似文献
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CHEN Jiang-ying CHEN Wei-qiu 《浙江大学学报(A卷英文版)》2007,8(7):1038-1043
The analytical solution for an annular plate rotating at a constant angular velocity is derived by means of direct displacement method from the elasticity equations for axisymmetric problems of functionally graded transversely isotropic media. The displacement components are assumed as a linear combination of certain explicit functions of the radial coordinate, with seven undetermined coefficients being functions of the axial coordinate z. Seven equations governing these z-dependent functions are derived and solved by a progressive integrating scheme. The present solution can be degenerated into the solution of a rotating isotropic functionally graded annular plate. The solution also can be degenerated into that for transversely isotropic or isotropic homogeneous materials. Finally, a special case is considered and the effect of the material gradient index on the elastic field is illustrated numerically. 相似文献
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INTRODUCTION For moderate thickness plate containing notches or holes, neither plane stress nor plane strain theory can describe its true deformation states (Jin and Hwang, 1989). This well known drawback has mo- tivated many analytical and numerical studies carried out to determine the effect of plate thickness on the in-plane stress distribution. Pioneering work on the along depth stress components, i.e. the K-M gener- alized plane strain theory was proposed by Kane and Mindlin (1956)… 相似文献
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Pure bending of simply supported circular plate of transversely isotropic functionally graded material 总被引：3，自引：0，他引：3
LI Xiang-yu DING Hao-jiang CHEN Wei-qiu 《浙江大学学报(A卷英文版)》2006,7(8):1324-1328
INTRODUCTION In recent years, functionally graded materials (FGMs) have attracted more and more attention. Due to their continuously varying material properties in space on the macroscopic scale, FGMs, therefore, are usually superior to conventional fiber-matrix materi-als in mechanical behavior, especially for perform-ance under thermal loading. Now FGMs have been widely used in various fields including electronics, chemistry, optics, biomedicine, etc. Heretofore, volumes of literatu… 相似文献
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采用任意拉格朗日—欧拉方法(ALE),对二维弹性分岔血管中的速度场和压力场进行了分析.通过弹性分岔血管中与刚性分岔血管中速度场和压力场的比较,结果表明:在刚性分岔血管中,其分岔口的速度和压力都比较大;而在弹性分岔血管中,由于管壁的弹性影响,其分岔口的速度和压力都比刚性分岔血管的小,更加接近于正常的生理状况.所以,弹性血管比刚性血管的模拟效果好,它既能够方便于我们了解心血管疾病的机理,尽早地预防心血管疾病,又能够为临床实验工作提供一种好的理论分析方法. 相似文献
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INTRODUCTION A traditional premise in the theory of com-posites is the continuity of tractions and displace-ments at constituent interfaces. However, the in-terfaces are generally weaker than the plies inlaminates, which then frequently suffer from failure(such as delamination, interlaminar slip, etc.) due tohigh stress concentration at the interfaces. Beforethe final failure, these interfaces are usuallyweakened and become imperfect due to the emer-gence of microcracks. There are nu… 相似文献
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The two dimensional problem of simply supported laminated isotropic strips with viscoelastic interfaces and under static loading was studied. Exact solution was derived based on the exact elasticity equation and the Kelvin-Voigt viscoelastic interfacial model. Numerical computations were performed for a strip consisting of three layers of equal thickness. Results indicated that the response of the laminate was very sensitive to the presence of viscoelastic interfaces. 相似文献
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研究我国城市居民家庭支出模式是有意义的。本文采用线性支出系统和广义线性支出系统,建立了我国城市居民家庭支出结构的数学模型。线性支出系统有助于人们搞清价格在家庭对各种商品支出份额配置上的作用和影响。根据线性支出系统和广义线性支出系统,我们求得价格弹性、交叉价格弹性和收入补偿价格弹性等。文章最后部分,我们对改善我国城市居民家庭支出结构提出一些建议。 相似文献
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平面体波在各向异性媒质中的传播 总被引：1，自引：0，他引：1
Combining the linear transformation and the solution technique for the cubic equation,a general closed-form analyti solution for bulk waves in orthotropic anisotropic materials is obtained.This method is straightforward and general.Degenerated cases include transversely isotropic,cubic,and isotropic materials.Numerical computations are carried out on a fiber-reinforced composite plate modeled as a transversely isotropic media.The fibers are parallel to the top and bottom surfaces of the plate ,and they are rotated counterclockwise around the plate normal through different angles.The two-dimensional slowness curves corresponding to different rotations are presented graphically.The wave propagation characteristics displayed in slowness surfaces for different fiber orientation are analyzed. 相似文献
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目的:探讨采用带血管蒂皮瓣、肌(皮)瓣修复下肢皮肤软组织缺损、重建功能、再造器官和改善外形的效果。方法:采用带血管蒂皮瓣、肌(皮)瓣,通过局部转移或移位,进行血管、神经吻合,覆盖因创伤造成的下肢软组织缺损。结果:本组共26例患者,一期治愈23例,治愈率88.5%;二期治愈3例,治愈率11.5%,总治愈率100%。结论:由于不同于传统的随意皮瓣,切取范围不受长宽比例限制,手术一次完成。极大可能的修复缺损的皮肤及软组织,保持患肢的长度及功能。 相似文献