无应力的

〕 Objective: To study the stress distribution and the mech anic in the implants with or without countersink with different thread pitch by dynamic 3-D FEM.

摘要〕 目的：研究有无防沉装置的两种种植体不同螺距的应力分布及力学相容性。

Meth od: The impl ants were studied by supper SAP93 program under the force of 0.8 s period b y the way of half sine wane.In group A the implants were without countersink, wh ile in group B those were with countersink.

采用三维有限元动态分析法，以Supper SAP93程序在周期为0.8 s的正弦半波力作用下对两种种植体进行应力分析，A组无防沉装置，B组有防沉装置。

Deformation modulus: the ratio of the vertical load to the vertical strain is called as Deformation modulus.

土的变形模量：土体在无侧向约束条件下，竖向应力与竖向应变的比值。

Results: The deviation and stress distribution of the edentulous jaws and the base plates were obtained.

结果：得出了七种模型的基托及无牙颌骨的位移及应力分布值。

Three-dimensional stress analysis was carried out for screws with four different radii and cross-sections of the taper screw including rectangle sections without, with single and double round angle transition for strengthening, and trapeziform section.

在此基础上应用ANSYS软件对无圆角、单圆角、双圆角矩形和梯形四种截面的螺杆进行了三维应力分析。

Thus, the formula for caculating the stress of the unbonded tendons is proposed.

确定了与β值，即可建立无粘结筋的应力计算公式。

According to the principle of elasticity-viscoelasticity, equations of stress and strainfor EMP surface layer under the load of different indenters and indenter contact whilesliding were calculated separately. The indenters contain sphere, cylinder and taper.

粘弹性对应原则，计算出了受一般外形压头法向无摩擦力作用下和受球、圆柱平头、圆锥形压头法向载荷作用下，以及在滑动过程中相应压头形态接触作用下EMP表层的应力、应变方程。

The mechanical properties had no significant difference between the two groups in peak load, maximal stress.

生物力学检测，与对照组比较最大负荷、最大应力、弹性模量、最大应变等的差异均无显著性意义。

Methods: 3-D FEM was used to make a comparative study of the effects of the implant to stress distribution of removable partial denture under different loads.

应用三维有限元法，在不同加载条件下分析比较有无种植体支持对于双侧后牙游离缺失可摘局部义齿应力分布的影响。

In this paper, the new method used to get the section resistance coefficient K is presented, the iterative procedure is established to calculate the internal forces of arch bridge with flat hinge joints, and the computational example is given.

例如无铰拱或双铰拱模型算法[1 ] ，当拱趾上缘出现裂缝时，按设计规范，在截面偏心距不超过规定值时，可保持拱趾受力状态不变，而考虑材料的塑性进行&应力重分布&计算。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。