The results show that the viscoelasticity of pcb and its size have distinct influence on dynamic properties of pcb under board - level drop impact 结果表明,电路板的黏性系数和尺寸对板的动力学特性有显著影响。
The influence of the coating viscoelasticity on the response has been investigated in detail and the imprinting effect of mips has been verified 详细探讨了膜的粘弹性对传感器响应的影响,验证了mip的印记效应。
In the systematic system , a direct method solution for symplectic eigenvalue problems is put forward . the symplectic method updated the solving system of the viscoelasticity to a new platform 在辛体系下建立了一种辛本征解直接方法,将粘弹性力学求解方法和思路上升到一个新的平台。
The large time behaviors are studied to the initial - boundary problems of 2x2 nonlinear hyperbolic system of conservation laws with relaxation and 2x2 nonlinear system of viscoelasticity in this thesis 本文研究具有松弛源项的2 2非线性双曲守恒组和2 2非线性粘弹性方程组的初边值问题解的大时间性态。
( 7 ) basing on defining damage variable with flaws in rock , this paper uses linear viscoelasticity fracture mechanics to set up a damage reep model and analyses the model ( 7 )在用岩石中大小、方位和位置均为随机分布的裂纹定义损伤变量基础上,利用线粘弹性断裂力学原理对考虑裂纹内水压的岩石的损伤蠕变问题进行了建模和分析。
From analysis of nanoidentation load - displacement data , it is possible to derive values of the elastic modulus , hardness , and properties associated within time - dependent deformation such as viscoelasticity 通过分析纳米压痕试验得到的力?位移数据,就可计算出材料的弹性模量、硬度以及与力作用时间长短有关的材料变形参数,如粘弹性参数。
( 6 ) basing on a constitutive model for elastic and damage rock , which is set up using the eshelby equivalent inclusion method and cdm , a damage viscoelasticity model for rock is deduced ( 6 )在采用各向同性介质中的eshelby等效夹杂理论和连续介质损伤力学( cdm )方法建立的岩石损伤本构模型基础上利用对应性原理建立了岩石材料的损伤粘弹性本构关系。
For this aim , the first step is to discuss constitutive relations of viscoelasticity and then bring forward a differential form for three dimensions viscoelastic constitutive relations ( kelvin model , maxwell model and three - level structure model ) 在实行上述研究目的和方法时,首先讨论粘弹性力学的本构关系,提出一种微分形式的三维基本本构方程( kelvin型, maxwell型和三体型) 。
The simpler explicit formulae for the prediction of the viscoelasticity property are obtained . ( see chapter 3 ) 4 . a homogenization - based method for predicting the viscoelastic property of unidirectional fiber reinforced composite materials is presented (详见第三章) 4 、建立了基于多尺度均匀化理论的单向纤维增强复合材料粘弹性性能预测的基本方法及其与夹杂体积份数的变化规律。
In the dynamic equation both the viscoelasticity properties of belt , the run resistance , the inertia force of take - up , the belt ' s elastic modulus influented by the deflection of belt and the initial stress have been considered 所建立模型的动力学方程不仅考虑了输送带的粘弹性力学性质、运行阻力、张紧装置的惯性力和输送带挠度变化下的弹性模量,同时也考虑了输送带初始张力的影响。
Viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like honey, resist shear flow and strain linearly with time when a stress is applied.