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1. 发明授权

US11958137B2 Unified fatigue life evaluation method for welded structures 有权
公开(公告)号：US11958137B2
公开(公告)日：2024-04-16
申请号：US17825657
申请日：2022-05-26
申请人： THE REGENTS OF THE UNIVERSITY OF MICHIGAN
发明人： Pingsha Dong , Xianjun Pei , Jifa Mei
IPC分类号： B23K31/02 , B23K31/12 , G01M5/00 , G06F30/23 , G06F119/04
CPC分类号： B23K31/02 , B23K31/12 , G01M5/0041 , G06F30/23 , G01N2203/0073 , G01N2203/0214 , G01N2203/0216 , G06F2119/04
摘要： Due to geometric discontinuities introduced by welding and joining processes, stresses or strain cannot be calculated reliably calculated using modern analytical and computer methods as result of stress or strain singularity at joint locations, which leads to severe mesh sensitivity. Design and fatigue evaluation of these structures remain empirical. This disclosure addresses mesh insensitivity of stress/strain calculations for welded structures through a cut-plane traction stress method through a novel post processing of conventional finite element computation results, as well as provides a unified fatigue evaluation procedure for fatigue design and structural life evaluation for both low-cycle and high cycle fatigue regime subjected to either proportional or non-proportional multiaxial fatigue loading, as well as a simple and reliable method for treating spot welds.

2. 发明授权

US09791356B2 Joint analyzing method, product designing method, and joint analyzing system 有权
公开(公告)号：US09791356B2
公开(公告)日：2017-10-17
申请号：US14971654
申请日：2015-12-16
申请人： SUBARU CORPORATION
发明人： Kazuaki Hirakawa , Megumi Hiraki , Kousaburou Akiba
IPC分类号： G06F17/50 , G01N3/02 , G01N3/00
CPC分类号： G01N3/02 , G01N3/00 , G01N2203/0216 , G01N2203/0296 , G06F17/5018
摘要： A joint analyzing method includes: performing a data measurement; performing a detailed analysis; performing a simplified analysis; performing a first repetition analysis in which the detailed analysis is repeated while modifying a first analysis model in which geometry of a joint surrounding region is modeled and an analysis technique in the detailed analysis, until a data measurement result and a detailed analysis result are brought into agreement; and performing a second repetition analysis in which the simplified analysis that takes into consideration an initial internal load of at least one junction in a load non-applied state obtained in the first repetition analysis is repeated while modifying a second analysis model rougher in element division of the geometry than the first analysis model and an analysis technique in the simplified analysis, until the data measurement result and a simplified analysis result are brought into agreement.

3. 发明申请

US20160238499A1 ANALYSIS METHOD OF TENSIONING PROCESS OF FINE MASK PLATE 审中-公开
标题翻译：细面板张力过程的分析方法
公开(公告)号：US20160238499A1
公开(公告)日：2016-08-18
申请号：US14778881
申请日：2015-01-16
申请人： BOE TECHNOLOGY GROUP CO., LTD. , ORDOS YUANSHENG OPTOELECTRONICS CO., LTD.
发明人： Fengli JI , Minghua XUAN , Shanshan BAI , Jiantao LIU , Jingbo XU
IPC分类号： G01N3/08
CPC分类号： G01N3/08 , G01N2203/0216 , G06F17/5018 , G06F2217/16
摘要： The present invention discloses an analysis method of a tensioning process of a fine mask plate. The analysis method, based on the simulation function of ANSYS software, finds an appropriate tensile force for stretching a fine mask plate and a corresponding actual counterforce applied to a metal frame before each fine mask plate is welded onto the metal frame through establishing a finite element model of the fine mask plate and a finite element model of the metal frame.. The analysis process requires no physical tests, thereby effectively avoiding damaging the fine mask plate and further effectively saving the test cost.
摘要翻译：本发明公开了一种精细掩模板的张紧过程的分析方法。基于ANSYS软件的仿真功能的分析方法，通过建立一个有限元素，在每个精细掩模板被焊接到金属框架之前，找到一个适当的张力来拉伸精细的掩模板和施加到金属框架上的相应的实际反作用力精密掩模板模型和金属框架的有限元模型。分析过程不需要物理测试，从而有效避免损坏精密掩模板，进一步有效节省测试成本。

4. 发明授权

US09405869B2 Rubber product elastic response performance prediction method, design method, and elastic response performance prediction apparatus 有权
标题翻译：橡胶制品弹性响应性能预测方法，设计方法和弹性响应性能预测装置
公开(公告)号：US09405869B2
公开(公告)日：2016-08-02
申请号：US13877607
申请日：2011-10-04
申请人： Keizo Akutagawa
发明人： Keizo Akutagawa
IPC分类号： G06F17/50 , G01N33/44
CPC分类号： G06F17/5018 , G01N33/445 , G01N2203/0092 , G01N2203/0216
摘要： An elastic response performance prediction method that employs a finite element analysis method to predict an elastic response performance expressing deformation behavior of a rubber product. The elastic response performance of the rubber product is predicted by employing a constitutive equation that expresses temperature and strain dependence of strain energy in the rubber product expressed using a parameter representing intermolecular interaction.
摘要翻译：一种弹性响应性能预测方法，其采用有限元分析方法来预测表示橡胶制品变形行为的弹性响应性能。通过使用表示使用表示分子间相互作用的参数表示的橡胶制品中的应变能的温度和应变依赖性的本构方程来预测橡胶产品的弹性响应性能。

5. 发明申请

US20130085727A1 Numerically simulating structural behaviors of embedded bi-materials using meshfree method 有权
标题翻译：使用无网格方法数值模拟嵌入式双材料的结构行为
公开(公告)号：US20130085727A1
公开(公告)日：2013-04-04
申请号：US13251654
申请日：2011-10-03
申请人： Cheng-Tang Wu
发明人： Cheng-Tang Wu
IPC分类号： G06F17/10
CPC分类号： G06F17/5018 , G01N2203/0216 , G06F2217/16 , G06F2217/44 , G06T17/20
摘要： Methods and systems for numerically simulating structural behaviors of embedded bi-materials are disclosed. At least first and second grid models are created independently for an embedded bi-material that contains an immersed material embedded entirely within a base material. First group of meshfree nodes represents the entire domain (i.e., base plus immersed materials). Second group of meshfree nodes represents the immersed or embedded material, which includes all interface nodes and nodes located within a space bordered by the material interface. Numerical structural behaviors of the embedded bi-material are simulated using the first and second set of meshfree nodes with a meshfree method that combines two meshfree approximations. The first meshfree approximation covers the first set of meshfree nodes and is based on properties of the base material, while the second meshfree approximation covers the second set of meshfree nodes and is based on a differential between the immersed and base materials.
摘要翻译：公开了用于数值模拟嵌入式双材料结构行为的方法和系统。至少第一和第二格栅模型是独立地为包含完全嵌入基材的浸入材料的嵌入式双材料而创建的。第一组无网格节点表示整个域（即，基底加上浸没的材料）。第二组无网节点代表浸没或嵌入的材料，其中包括位于物料界面边界的空间内的所有接口节点和节点。嵌入式双材料的数值结构行为使用组合两个无网格近似的无网格方法，使用第一组和第二组无网格节点进行模拟。第一个无网格近似覆盖第一组无网格节点，并且基于基础材料的性质，而第二无网格近似覆盖第二组无网格节点，并且基于浸没和基材之间的差异。

6. 发明申请

US20100121621A1 FRACTURE PREDICTION METHOD, PROCESSING DEVICE, PROGRAM PRODUCT AND RECORDING MEDIUM 有权
标题翻译：断裂预测方法，处理装置，程序产品和记录介质
公开(公告)号：US20100121621A1
公开(公告)日：2010-05-13
申请号：US12595418
申请日：2008-04-14
申请人： Akihiro Uenishi , Takashi Ariga , Shigeru Yonemura , Jun Nitta , Tohru Yoshida
发明人： Akihiro Uenishi , Takashi Ariga , Shigeru Yonemura , Jun Nitta , Tohru Yoshida
IPC分类号： G06F17/10 , G06F19/00
CPC分类号： G06F17/5095 , G01N2203/0216 , G06F17/5018 , G06F2217/42
摘要： When discretizing an analysis target part into plural elements and performing analysis, sheet thickness reduction rate or maximum principal strain at an equivalent position including a same element is compared by either a manner of combining two adjacent elements after the analysis or a manner of changing an element discretization size with two types and performing the analysis, and the element where the difference is large is extracted as a fracture risk portion.With this structure, a fracture risk portion can be extracted reliably when a fracture is predicted by a finite element method.
摘要翻译：当将分析目标部分离散成多个元素并执行分析时，通过在分析之后组合两个相邻元素的方式或者改变元素的方式来比较包括相同元素的等效位置处的片材厚度减小率或最大主应变两种类型的离散化大小进行分析，提取差异较大的元素作为断裂风险部分。利用这种结构，当通过有限元法预测断裂时，可以可靠地提取断裂风险部分。

7. 发明申请

US20090228246A1 Methods and systems of engineering analysis using a hybrid approach with FEM and adaptive SPH 有权
标题翻译：使用FEM和自适应SPH的混合方法进行工程分析的方法和系统
公开(公告)号：US20090228246A1
公开(公告)日：2009-09-10
申请号：US12042385
申请日：2008-03-05
申请人： Jean Luc Lacome
发明人： Jean Luc Lacome
IPC分类号： G06F17/10
CPC分类号： G01N3/48 , G01N2203/0067 , G01N2203/0087 , G01N2203/0216 , G06F2217/16
摘要： Systems and methods of computer aided engineering analysis using hybrid approach of finite element method (FEM) and adaptive smoothed particle hydrodynamics (SPH) are described. According to one aspect, a computer-aided engineering analysis is performed to simulate an impact event between structures. A FEM grid model is created to represent the structures using a plurality of solid elements which represents geometry and material properties. Once a contact between two structures resulted into a material or structural failure according to predefined material constitutive equation, solid elements representing the failed portion of the structure are removed. Each failed solid element is then replaced by a plurality of particles to be analyzed using the SPH analysis. The particles replacing the failed element inherit all of the states and properties of the failed element, such as location, mass, velocity, acceleration, etc. The replacement is conducted according to the principles of mass, momentum and energy conservation.
摘要翻译：描述了使用有限元方法（FEM）和自适应平滑粒子流体动力学（SPH）的混合方法的计算机辅助工程分析的系统和方法。根据一个方面，执行计算机辅助工程分析以模拟结构之间的冲击事件。创建有限元网格模型以表示使用表示几何和材料属性的多个实体元素的结构。一旦两个结构之间的接触导致根据预定义材料本构方程的材料或结构破坏，则表示结构的失效部分的实体元件被去除。然后使用SPH分析将每个失效的固体元素替换为待分析的多个颗粒。代替故障元件的粒子继承了故障元素的所有状态和属性，如位置，质量，速度，加速度等。根据质量，动量和节能原理进行更换。

8. 发明申请

US20070199924A1 Fracture Prediction Device For Spot Welded Portion, Method Of The Same, Computer Program, And Computer Readable Recording Medium 有权
标题翻译：点焊部分断裂预测装置，方法，计算机程序和计算机可读记录介质
公开(公告)号：US20070199924A1
公开(公告)日：2007-08-30
申请号：US10599921
申请日：2005-04-12
申请人： Hiroshi Yoshida , Naruhiko Nomura , Akihiro Uenishi
发明人： Hiroshi Yoshida , Naruhiko Nomura , Akihiro Uenishi
IPC分类号： B23K11/25
CPC分类号： G01N3/24 , B23K11/11 , G01N3/08 , G01N2203/0067 , G01N2203/0214 , G01N2203/0216 , G01N2203/0218 , G01N2203/0296 , G06F17/5018
摘要： According to exemplary embodiments of the present invention, a fracture prediction device for a spot welded portion can be provided. For example, the device may include an input arrangement configured to input all or some of a material strength, a plate thickness, a nugget diameter of a spot welding, a plate width of a joint, and a rotation angle of the joint in a tension test, based on a cross tension test and/or a shear tension test at a spot welded joint. The device can also include a first calculation arrangement configured to calculate a fracture strength parameter of the spot welded portion from all or any of the material strength, the plate thickness, the nugget diameter of the spot welding, the plate width of the joint, and the rotation angle of the joint in the tension test. A parameter storage arrangement may also be provided which can be configured to store the fracture strength parameter by each steel type. Further, the device may further have a second calculation arrangement configured to determine a fracture of the spot welded portion by installing the fracture strength parameter stored in the parameter storage arrangement into a fracture prediction formula in which a deformation at a periphery of the spot welding is modeled by a finite element procedure. Exemplary embodiments of the method software arrangement and computer accessible medium performing similar procedures can also be provided.
摘要翻译：根据本发明的示例性实施例，可以提供一种用于点焊部分的断裂预测装置。例如，设备可以包括输入装置，其被配置为输入材料强度，板厚度，点焊的熔核直径，接头的板宽度和接头处于张力的旋转角度的全部或一些基于交叉拉伸试验和/或点焊接头处的剪切张力试验进行试验。该装置还可以包括第一计算装置，其被配置为根据材料强度，板厚度，点焊的熔核直径，接头的板宽度以及所述点焊的直径来计算点焊部的断裂强度参数接头在张力试验中的旋转角度。还可以提供参数存储装置，其可被配置为通过每种钢种来存储断裂强度参数。此外，该装置还可以具有第二计算装置，其被配置为通过将存储在参数存储装置中的断裂强度参数设置为断点预测公式来确定点焊部分的断裂，其中点焊周边的变形为由有限元程序建模。还可以提供方法软件配置和执行类似过程的计算机可访问介质的示例性实施例。

9. 发明申请

US20060219026A1 STRUCTURAL STRESS ANALYSIS 有权
标题翻译：结构应力分析
公开(公告)号：US20060219026A1
公开(公告)日：2006-10-05
申请号：US11424404
申请日：2006-06-15
申请人： Pingsha Dong , Jinmiao Zhang , Jeong Hong
发明人： Pingsha Dong , Jinmiao Zhang , Jeong Hong
IPC分类号： G01L5/00
CPC分类号： G01L5/00 , B23K31/02 , G01M5/0041 , G01N2203/0073 , G01N2203/0214 , G01N2203/0216 , G06F17/5018
摘要： Structural stress in a fatigue-prone region of a structure is determined and analyzed by using: i) the nodal forces and displacement values in the fatigue-prone region, or ii) equilibrium equivalent simple stress states consistent with elementary structural mechanics in the fatigue-prone region. Of course, it is contemplated that combinations, equivalents, or variations of the recited bases may alternatively be employed.
摘要翻译：通过使用以下方法确定和分析结构疲劳易发区域中的结构应力：i）疲劳易发区域中的节点力和位移值，或ii）与疲劳 - 应变区域中的基本结构力学一致的平衡等效简单应力状态，易发地区。当然，也可以考虑使用所引用碱基的组合，等价物或变体。

10. 发明授权

US06813592B1 Method for crack propagation simulation 失效
标题翻译：裂纹扩展模拟方法
公开(公告)号：US06813592B1
公开(公告)日：2004-11-02
申请号：US09597471
申请日：2000-06-20
申请人： Guido Dhondt
发明人： Guido Dhondt
IPC分类号： G06F1750
CPC分类号： G01N3/02 , G01N2203/0066 , G01N2203/0214 , G01N2203/0216
摘要： A method for crack propagation simulation in which a definition of a three-dimensional structure and of an initial crack are provided, a cut of the structure along a crack propagation is calculated, a new crack front is determined by determining stress values by a finite element calculation and by using a crack propagation function. The propagated crack is then triangulated, and the aforementioned steps are repeated until a predetermined end condition is fulfilled.
摘要翻译：提供了一种裂纹扩展模拟方法，其中提供三维结构和初始裂纹的定义，计算沿裂纹扩展的结构切割，通过有限元素确定应力值来确定新的裂纹前沿计算和使用裂纹扩展函数。然后将传播的裂纹进行三角测量，并重复上述步骤，直到满足预定的结束条件。

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