Software stress analysis

Thermal stress calculations in the five cell stack for the temperature distribution presented above were performed by Vallum (2005) using the solid modeling software ANSYS . The stack is modeled to be consisting of five cells with one air channel and gas channel in each cell. Two dimensional stress modeling was performed at six different cross-sections of the cell. The temperature in each layer obtained from the above model of Burt et al. (2005) is used as the nodal value at a single point in the corresponding layer of the model developed in ANSYS and steady state thermal analysis is done in ANSYS to re-construct a two-dimensional temperature distribution in each of the cross-sections. The reconstructed two dimensional temperature is then used for thermal stress analysis. The boundary conditions applied for calculations presented here are the bottom of the cell is fixed in v-dircction (stack direction), the node on the bottom left is fixed in x-direction (cross flow direction) and y-direction and the top part is left free to... 

The finite element (FE) model of the FSSW process was done using ABAQUS/Explicit software. A 3-D dynamic fully coupled thermal-stress analysis was performed to obtain thermomechanical responses of the FSSW process. Two features in the FE package were deployed in order to obtain the results ... 

Three-dimensional models also allow engineers to test their designs before the part or product is actually made. The CAD software can also run a stress analysis on a part to determine fracture points. Engineers are able to see what their part will look like, how it will work with other parts, what materials are best to use, and whether any changes are needed in the design. 

The information systems can be combined with advanced plant modelling systems, and interface to external software packages, such as for process modelling and pipe stress analysis. 

NETL s CFD research has demonstrated that CFD-based codes can provide detailed temperature and chemical species information needed to develop improved fuel cell designs. The output of the FLUENT-based fuel cell model has been ported to finite element-based stress analysis software to model thermal stresses in the porous and solid regions of the cell. In principle, this approach can be used for other types of fuel cells as well, as demonstrated by Arthur D. Little and NETL (16,18)... 

Pipe flexibility is required to help control stress in liquid piping systems. Stress analysis may be performed using specialized software. Considerations that must be accounted for in routing piping systems in order to minimize stress include ... 

Conduct stress analysis using suitable computer software to determine stress concentration and distribution... 

TESS (Pyke 2000), with last three programs also having a provision for effective-stress analysis. The study compared the programs in total-stress mode and found that, when input is properly controlled, most of the software provided similar results. 

Data analysis routines may change with time, and it is desirable to be able to reanalyze old data with new analysis software. Our tensile test analysis software creates plots of engineering stress as a function of engineering strain, as illustrated in Figure 3. Our flexure test software plots maximum fiber stress as a function of maximum fiber strain, with the option of including Poisson s ratio in the calculations. Both routines generate printed reports which present the test results in tabular form, as illustrated in Figure 4. 

Rotational rheometer (unithi.i e.g., Bohlin Instruments, Chandler Engineering) controlled stress (for applied step shear stress) or controlled strain (for applied step shear strain) with appropriate software for rheometer control, data acquisition, and data analysis... 

The software test strategy and detailed test scripts (protocol) are reviewed and approved by the Project Team. This review will verify that the test cases will stress the program interfaces, challenge the data boundaries and limits, and verily that the test cases are traceable to the appropriate clauses in the requirements specification deliverable. The review also verifies that the test cases adequately cover the risks identified in the Risk Analysis. The unit/ integration test results are documented by the programmer, and reviewed, approved, signed, and dated by QA. 

In this study, residual thermal stresses were also eonsidered because co-cured lap joints generally undergo temperature drop (from 120D to 20D) during the curing process. The stress distributions in the co-cured single and double lap joints were analyzed using ABAQUS i.8 to be commercial finite element analysis software [21],... 

Although, the powder method was developed as early as 1916 by Debye and Scherrer, for more than 50 years its use was almost exclusively limited to qualitative and semi-quantitative phase analysis and macroscopic stress measurements. The main reason for this can be found in what is known as the principal problem of powder diffraction accidental and systematic peak overlap caused by a projection of three-dimensional reciprocal space on to the one-dimensional 26 axis, leading to a strongly reduced information content compared to a single crystal data set. However, despite the loss of angular information, often sufficient information resides in the ID dataset to reconstruct the 3D structure. Indeed, quantitative analysis of the pattern using modern computers and software yields the wealth of additional information about the sample structure that is illustrated in Figure 1. Modern... 

T3) are available in most FEA software packages and stresses are usually averaged by the FEA software packages to provide more accurate stress values when mapped (contoured) on to the mesh. A good first cut to the understanding of analysis results is the use of the von Mises stress (effective or equivalent stress). Fig. 10 shows the von Mises stress contour mapped to the FEA mesh in pounds/square inch (PSI). 

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