公开(公告)号：US07168327B2

公开(公告)日：2007-01-30

申请号：US10828976

申请日：2004-04-21

申请人： E. Ray Harrell, Jr.

发明人： E. Ray Harrell, Jr.

IPC分类号： G01D1/00

CPC分类号： G01N3/32 ,  G01N33/442 ,  G01N2203/0071 ,  G01N2203/0089 ,  G01N2203/0094 ,  G01N2203/0214 ,  G01N2203/0246

摘要： A method is disclosed of using external polymeric analytical techniques to predict in-vivo polymeric performance, more particularly, viscoelastic property characterization for performance modeling of biomedical devices that incorporate a polymeric component and are load-bearing during service. Time-Temperature Superposition can be used to accelerate external testing of pertinent properties. Boltzmann's superposition provides a mathematical methodology for determining the time-dependent strain that develops in response to an imposed stress history. The modeling of the present invention provides an opportunity to describe and predict behavior of the device during in-vivo service, as well as it providing a basis for evaluating alternate “candidate” polymers for use in the construction of the device.

摘要翻译： 公开了一种使用外部聚合物分析技术来预测体内聚合物性能的方法，更具体地说，用于结合聚合物组分并在使用期间承载的生物医学装置的性能建模的粘弹性性质表征。 时间 - 温度叠加可用于加速相关性能的外部测试。 玻尔兹曼叠加提供了一种数学方法，用于确定响应强加的压力历史而发展的时间依赖性应变。 本发明的建模提供了在体内服务期间描述和预测装置的行为的机会，并且为提供用于评估用于构造装置的替代“候选”聚合物提供基础。

公开(公告)号：US20050071091A1

公开(公告)日：2005-03-31

申请号：US10989771

申请日：2004-11-16

申请人： Pingsha Dong ,  Jinmiao Zhang ,  Jeong Hong

发明人： Pingsha Dong ,  Jinmiao Zhang ,  Jeong Hong

IPC分类号： B23K31/02 ,  G01N3/02 ,  G06F17/50 ,  G01L1/00

CPC分类号： G01L5/00 ,  B23K31/02 ,  G01M5/0041 ,  G01N2203/0073 ,  G01N2203/0214 ,  G01N2203/0216 ,  G06F17/5018

摘要： This need is met by the present invention wherein structural stress in a fatigue-prone region of a structure is determined by using the nodal forces and displacement values in the fatigue-prone region, or equilibrium-equivalent simple stress states consistent with elementary structural mechanics in the fatigue-prone region. The determination is substantially independent of mesh size and is particularly well-suited for applications where S-N curves are used in weld fatigue design and evaluation, where S represents nominal stress or stress range and N represents the number of cycles to failure. The present invention is directed to structural stress analysis through various combinations of modeling, calculation, and direct measurement schemes.

公开(公告)号：US20020178832A1

公开(公告)日：2002-12-05

申请号：US10108150

申请日：2002-03-27

发明人： Bahman Sarabi ,  Martin Wanders ,  Dietmar Wachtler ,  Andreas Wende

IPC分类号： G01D001/16

CPC分类号： G06F17/5018 ,  G01N2203/0214 ,  G06F2217/80

摘要： The relationship between the stress null and the strain null is firstly established in step 100 with short-term tests as a function of the temperature T. In steps 101 to 104, a Findley model is extended in such a way as to obtain a relationship between the strain null and the stress null as a function of the time t and the temperature T. The two models are combined in steps 105 and 106, so as to obtain overall a relationship between the stress null and the strain null as a function of the time t and the temperature T.

摘要翻译： 应力σ与应变εi之间的关系首先在短期测试中作为温度T的函数在步骤100中建立。在步骤101至104中，以一种方式扩展了一个Findley模型，以获得 应变εi和应力σ作为时间t和温度T的函数。两个模型在步骤105和106中组合，以便总体上获得应力σ和应变εi之间的关系作为函数 时间t和温度T.

公开(公告)号：US5154788A

公开(公告)日：1992-10-13

申请号：US725717

申请日：1991-07-03

申请人： Francis C. Spicola ,  Neil J. Dubois

发明人： Francis C. Spicola ,  Neil J. Dubois

IPC分类号： G01N1/36 ,  G01N3/00 ,  G01N3/02 ,  G01N3/08 ,  G01N33/36

CPC分类号： G01N3/08 ,  G01N1/36 ,  G01N33/365 ,  G01N2203/0016 ,  G01N2203/0025 ,  G01N2203/0214 ,  G01N2203/0278 ,  G01N2203/028

摘要： A continuous filament is selected from among a group of appropriate types of filaments, and selection of the filament length and the filament thickness is made as well. A matrix material is selected from a group of appropriate types of matrix materials. Filaments of the selected type, length and thickness are undirectionally imbedded in the selected matrix to provide a uniaxial continuously reinforced composite. The Young's modulus, E.sub.c, and the shear modulus G.sub.c, are calculated for the composite. Mathematical formulas are provided for calculation of upper and lower bounds of transverse stiffness, B. A mathematical formula is provided for calculation of critical comprehensive stress, P.sub.c. Transverse stiffness, B, is involved as one of the factors in this formula. Either one or the other of the upper bound of B or the lower bound of B are alternatively applied in calculating P.sub.c, depending upon a consideration related to the shape of a cross section of the structural member into which the composite is to be formed. If the shape of the outline of such cross section includes at least one angular break, then the lower bound of B is applied in calculating P.sub.c. If the shape of the outline of such cross section is curvilinear in its entirety, then the upper bound of B is applied in calculating P.sub.c. A structural member subjected to load values below P.sub.c will be free from load-induced microbuckling with a high degree of certainty.

摘要翻译： 从一组适当类型的长丝中选择连续的长丝，并且还选择长丝长度和长丝厚度。 基质材料选自一组合适类型的基质材料。 所选择的类型，长度和厚度的长丝不定向嵌入所选择的基体中以提供单轴连续增强的复合材料。 对于复合材料计算杨氏模量，Ec和剪切模量Gc。 提供数学公式用于计算横向刚度的上限和下限B.提供了一个计算临界综合应力Pc的数学公式。 横向刚度B作为该公式中的一个因素。 根据与要形成复合材料的结构构件的横截面的形状有关的考虑，可以将B的上限或B的下限中的任何一个或B的下限替换地应用于计算Pc。 如果这种横截面的轮廓的形状包括至少一个角断裂，则在计算Pc中应用B的下限。 如果这种横截面的轮廓的形状是整体的曲线，则在计算Pc中应用B的上限。 承受低于Pc的负载值的结构件将以高度的确定性无负载诱导的微扣。

公开(公告)号：US20160161382A1

公开(公告)日：2016-06-09

申请号：US14897057

申请日：2014-06-26

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Shigeru YONEMURA ,  Takuya KUWAYAMA ,  Akihiro UENISHI ,  Toshiyuki NIWA

IPC分类号： G01N3/20

CPC分类号： G01N3/20 ,  G01N2203/0212 ,  G01N2203/0214 ,  G06F17/5009 ,  G06F17/5018 ,  G06F2217/16 ,  G06F2217/42

摘要： A bending fracture limit stress is calculated for each of (bend radius at sheet thickness center of a metal sheet)/(initial sheet thickness of the metal sheet); a fracture limit curve and a fracture limit stress are calculated from work hardening characteristics; a fracture limit curve corresponding to (the metal sheet bend radius at sheet thickness center)/(the initial sheet thickness of the metal sheet) is calculated; a corresponding fracture limit stress is calculated from stress of the element subject to determination and the fracture limit curve; a risk ratio that is a ratio between the stress of the element subject to determination and the fracture limit stress is computed; and performing fracture determination for the element subject to determination based on the risk ratio.

摘要翻译： 对于（金属板的板厚中心处的弯曲半径）/（金属板的初始板厚），计算出弯曲断裂极限应力。 断裂极限曲线和断裂极限应力由加工硬化特性计算; 计算对应于（板厚中心处的金属板弯曲半径）/（金属板的初始板厚度）的断裂极限曲线; 根据待测元素的应力和断裂极限曲线计算相应的断裂极限应力; 计算作为确定要素的应力与断裂极限应力之间的比率的风险比; 并根据风险比进行判定要素的断裂判定。

公开(公告)号：US20140229149A1

公开(公告)日：2014-08-14

申请号：US14106919

申请日：2013-12-16

申请人： Xuefei Guan ,  Jingdan Zhang ,  Shaohua Kevin Zhou ,  Kai Kadau ,  Yan Guo ,  El Mahjoub Rasselkorde ,  Waheed A. Abbasi ,  Chin-Sheng Lee ,  Ashley L. Lewis ,  Steve H. Radke

发明人： Xuefei Guan ,  Jingdan Zhang ,  Shaohua Kevin Zhou ,  Kai Kadau ,  Yan Guo ,  El Mahjoub Rasselkorde ,  Waheed A. Abbasi ,  Chin-Sheng Lee ,  Ashley L. Lewis ,  Steve H. Radke

IPC分类号： G06N7/00 ,  G06F17/50

CPC分类号： G06N7/005 ,  G01N29/4472 ,  G01N2203/0066 ,  G01N2203/0073 ,  G01N2203/0214 ,  G01N2291/0258 ,  G06F17/5009

摘要： A method for probabilistic fatigue life prediction using nondestructive testing data considering uncertainties from nondestructive examination (NDE) data and fatigue model parameters. The method utilizes uncertainty quantification models for detection, sizing, fatigue model parameters and inputs. A probability of detection model is developed based on a log-linear model coupling an actual flaw size with a nondestructive examination (NDE) reported size. A distribution of the actual flaw size is derived for both NDE data without flaw indications and NDE data with flaw indications by using probabilistic modeling and Bayes theorem. A turbine rotor example with real world NDE inspection data is presented to demonstrate the overall methodology.

摘要翻译： 考虑非破坏性检查（NDE）数据和疲劳模型参数的不确定性，使用非破坏性测试数据的概率疲劳寿命预测方法。 该方法利用不确定性量化模型进行检测，大小，疲劳模型参数和输入。 基于将实际缺陷大小与非破坏性检查（NDE）报告的大小相联系的对数线性模型开发了检测概率。 通过使用概率建模和贝叶斯定理，可以为无缺陷指示的NDE数据和缺陷指示的NDE数据导出实际缺陷大小的分布。 提出了具有真实世界NDE检测数据的涡轮转子实例，以演示整体方法。

公开(公告)号：US20120065934A1

公开(公告)日：2012-03-15

申请号：US13373219

申请日：2011-11-07

申请人： Hiroshi Shimanuki ,  Tetsuro Nose

发明人： Hiroshi Shimanuki ,  Tetsuro Nose

IPC分类号： G06F19/00

CPC分类号： G01N3/32 ,  G01N2203/0214

摘要： An effective volume Vep of a member is calculated with a stress correction amount σcorr added to an effective stress (stress amplitude) σip at each position of the member so that a fatigue strength of the member varying corresponding to an average stress varying depending on the position of the member is apparently constant at a value when the average stress on the member is 0 (zero) irrespective of the position of the member, and a cumulative fracture probability Pfp due to fatigue of the member is derived using the effective volume Vep of the member.

摘要翻译： 通过在构件的每个位置处添加到有效应力（应力振幅）＆sgr; ip的应力校正量＆sgr corr来计算构件的有效体积Vep，使得构件的疲劳强度随着平均应力变化而变化 取决于构件的位置，当构件的平均应力为0（零）而不考虑构件的位置时，构件的位置显然是恒定的，并且使用有效的构件导出由于构件的疲劳引起的累积的断裂概率Pfp 成员体积Vep。

公开(公告)号：US07752917B2

公开(公告)日：2010-07-13

申请号：US10556388

申请日：2003-05-12

申请人： Noboru Tomioka

发明人： Noboru Tomioka

IPC分类号： G01N3/24

CPC分类号： G06F17/5018 ,  G01N3/00 ,  G01N2203/0073 ,  G01N2203/0214 ,  G01N2203/0216 ,  G06F2217/42 ,  G06F2217/76

摘要： A fatigue life estimating method for a spot welded structure is provided comprising the steps of providing a shell model of a spot welded structure for a finite element method analyzing process, calculating the nominal structural stress on a nugget as the center of the spot welded structure using a disk bending theory and a two-dimensional elastic theory of the elastodynamics with the partial loads exerted on the nugget and the deflection on the circumference of a circle, D in diameter, in which the nugget is located, which have been calculated by the finite element method analyzing process of the shell model, and estimating the fatigue life of the spot welded structure from the nominal structure stress. According to the method, the fatigue life of the spot welded structure can be estimated easily, readily, and accurately.

摘要翻译： 提供一种点焊结构的疲劳寿命估计方法，包括以下步骤：提供用于有限元法分析过程的点焊结构的壳模型，计算熔核上的标称结构应力作为点焊结构的中心，使用 圆盘弯曲理论和弹性动力学的二维弹性理论，其中施加在熔核上的部分载荷和圆形圆周上的弯曲，直径（D），其中熔核位于其中，其由有限的 模型的元素分析过程，以及从标称结构应力估计点焊结构的疲劳寿命。 根据该方法，可以容易且准确地估计点焊结构的疲劳寿命。

公开(公告)号：US20090254286A1

公开(公告)日：2009-10-08

申请号：US12084607

申请日：2005-12-02

申请人： Sonia Tulyani ,  Alexander Staroselsky ,  Igor I. Fedchenia ,  Hongmei Wen ,  Clark V. Cooper ,  Susanne M. Opalka

发明人： Sonia Tulyani ,  Alexander Staroselsky ,  Igor I. Fedchenia ,  Hongmei Wen ,  Clark V. Cooper ,  Susanne M. Opalka

IPC分类号： G06F19/00 ,  G06G7/48

CPC分类号： G06F17/5009 ,  G01N2203/0073 ,  G01N2203/0214 ,  G06F2217/80

摘要： There is a method for modeling the surface fatigue life of a mechanical component. The method has the following steps: a) modeling the surface fatigue life of the mechanical component on an atomistic scale to form an atomistic model, b) modeling the surface fatigue life of the mechanical component on a mesoscale to form a mesoscale model, c) modeling the surface fatigue life of the mechanical component on a macroscale to form a macroscale model, and d) testing the surface fatigue life of the mechanical component. Feedback from the macroscale model is employed at least once to validate the atomistic model. Feedback from the macroscale model is employed at least once to validate the mesoscale model. Feedback from the testing is employed at least once to validate the macroscale model. There is also an interactive, multiscale model for prediction surface fatigue life or degradation rate for a mechanical component.

摘要翻译： 有一种用于建模机械部件的表面疲劳寿命的方法。 该方法具有以下步骤：a）在原子尺度上对机械部件的表面疲劳寿命建模以形成原子模型，b）在中尺度上对机械部件的表面疲劳寿命进行建模以形成中尺度模型，c） 在宏观尺度上对机械部件的表面疲劳寿命建模以形成宏观尺度模型，以及d）测试机械部件的表面疲劳寿命。 至少使用宏观模型的反馈来验证原子模型。 至少使用宏观模型的反馈来验证中尺度模型。 至少一次使用测试的反馈来验证宏观尺度模型。 还有一个用于预测表面疲劳寿命或机械部件的降解速率的交互式多尺度模型。

公开(公告)号：US20090211366A1

公开(公告)日：2009-08-27

申请号：US10556388

申请日：2003-05-12

申请人： Noboru Tomioka

发明人： Noboru Tomioka

IPC分类号： G01N3/24

CPC分类号： G06F17/5018 ,  G01N3/00 ,  G01N2203/0073 ,  G01N2203/0214 ,  G01N2203/0216 ,  G06F2217/42 ,  G06F2217/76

摘要： A fatigue life estimating method for a spot welded structure is provided comprising the steps of providing a shell model of a spot welded structure for a finite element method analyzing process, calculating the nominal structural stress on a nugget as the center of the spot welded structure using a disk bending theory and a two-dimensional elastic theory of the elastodynamics with the partial loads exerted on the nugget and the deflection on the circumference of a circle, D in diameter, in which the nugget is located, which have been calculated by the finite element method analyzing process of the shell model, and estimating the fatigue life of the spot welded structure from the nominal structure stress.According to the method, the fatigue life of the spot welded structure can be estimated easily, readily, and accurately.

摘要翻译： 提供一种点焊结构的疲劳寿命估计方法，包括以下步骤：提供用于有限元法分析过程的点焊结构的壳模型，计算熔核上的标称结构应力作为点焊结构的中心，使用 圆盘弯曲理论和弹性动力学的二维弹性理论，其中施加在熔核上的部分载荷和圆形圆周上的弯曲，直径（D），其中熔核位于其中，其由有限的 模型的元素分析过程，以及从标称结构应力估计点焊结构的疲劳寿命。 根据该方法，可以容易且准确地估计点焊结构的疲劳寿命。