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ANSYS LS

ls dyna crack version

Overall correlation between the simulation and test data is considered to be good. By explicitly accounting for the displacement of the rail, the pendulum response can be uniquely obtained. A model of a safety-shape bridge rail with New Jersey profile was developed under this research effort. The fracture profile of the parapet is shown in Figure 124 with the steel components of the parapet removed for better visualization. Whereas the pendulum response in tests P3, P4, P5, and P7 appeared reasonably consistent, the response measured in the calibration tests differed.

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ls dyna crack version

The research team used the Linux Intel 32 bit architecture version 971 release 1708 single precision release to maintain consistency and avoid potential software glitches associated with beta releases that occurred subsequent to the project's initiation. Description Maximum Peak Measured Force kN kips Test P5 133. It is divided into an elastic- plastic compaction model that is supposed to be run in a first phase, and a viscoelastic sintering model that should be run in a second phase. A two-dimensional biasing scheme was incorporated into the model of the concrete parapet. Use of the pendulum bogie provided more controlled tests and eliminated many variables associated with the comparison of simulation to full-scale vehicle crash tests.

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ls

ls dyna crack version

The second aspect investigated was an enhancement of the anchor bolt connection between the base plate and concrete parapet. Analyses of T4 bridge Rail Numerous analyses were conducted using the models of the T4 bridge rail variants as part of the evaluation of the concrete material model. In each test, the impact forces caused the concrete to fracture and spall off the field side of the parapet. Please note that these solvers are currently only supported in a subset of the double precision, R7. D software was available for simulating impact, and 2. Extend non- linear strain path.

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ANSYS LS

ls dyna crack version

This modeling change was considered to more accurately represent the behavior of the actual connection without significantly affecting computer processing time. As the research progressed, it was observed that the impact forces imparted by the pendulum model did not correspond to those measured in the pendulum tests. However, its density was increased to account for mass of the removed cartridges. Overview This task involved modeling and analyzing a roadside safety structure made of concrete and using the results to help define the applicability of the concrete material model to the analysis and design of concrete roadside safety structures. A model of a safety-shape bridge rail with New Jersey profile was developed for this purpose. The user interface is designed to be both efficient and intuitive.

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ls

ls dyna crack version

Various steps of this process were systematically repeated to evaluate sensitivity of the model's response to changes in certain modeling and material parameters. The input of nodes on the element cards for such a pentahedron is given by: N1,N2,N3,N3,N4,N5,N6,N6. As shown in Table 12, the peak impact force in the simulation of the T4 bridge rail system with four-bolt anchorage compares favorably with those measured in the corresponding pendulum tests. As with the original calibration, the recalibration process involved iteratively adjusting the stiffness values of the nonlinear spring model until the resulting force-time history closely matched data measured in the test P5. Although this artificially increased the stiffness of the parapet to some degree, it provided a more computationally efficient means of evaluating the effect of model changes on parapet response.

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CAE

ls dyna crack version

In the simulations conducted with the parapet-only subsystem, the bottom of the parapet and the lowermost points of the vertical reinforcement were constrained i. However, when these values were obtained, it was noticed that the printed output did not correspond to the format provided in the draft manual. D source code was released into the public domain without restrictions after a request from France. Full System Analysis: Four-Bolt Design The parameters used in the analysis of the parapet-only simulation of the modified T4 parapet system with four-bolt anchorage and 254-mm- 10-inch- wide parapet were incorporated into the full system model that included the bridge deck. For the design variation with the 254-mm- 10 inch- wide parapet, the test designations were P3 and P4. Recall that no visible damage was observed after test P5, and only small hairline cracks were found after test P7. D used explicit time integration to study nonlinear dynamic problems, with the original applications being mostly stress analysis of structures undergoing various types of impacts.


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CAE

ls dyna crack version

Input files can also be prepared with the aid of a graphical preprocessor. The contact definition between the parapet and deck represents the construction joint that exists between these two components. It is speculated that the crush properties of the honeycomb material used to construct the crushable nose assembly in the 1997 rigid pole calibration tests differed from those of the honeycomb materials used in the 2002 pendulum tests of the T4 bridge rail specimens. Additional checks on the properties of the aluminum honeycomb material commonly used in the crushable nose assembly of the pendulum bogie indicated that the material stiffness can vary considerably e. The short input format will work with default model parameters based on the user-supplied compression strength of concrete f ' C and the maximum aggregate size Dagg ; the long format requires the user to explicitly define all the model parameters. Apply proper probability density function to part's temperature created by the particle impact.

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Welcome to the LS

ls dyna crack version

If left blank, default is 19 mm 0. The pre-processor used for this study was HyperMesh ®. Fixed bug in binary file output d. As shown in Figure 95, the pendulum configuration used in the rigid pole test has a different force-time history than the pendulum used in the test of the almost rigid T4 rail with 317. Following E a , the next 5 material constants must be E b , E c , v ba , v ca , and v cb. The meshing across the width of the parapet was kept semi-uniform with an element size of 16 mm 0.

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ANSYS LS

ls dyna crack version

The fracture energy related parameters G fc , G ft , G fs, repow are part of the long input format. It is noteworthy that the rail-post-base plate assembly rigidly rotated and subsequently rebounded as observed in the actual pendulum tests. Fracture profile of modified T4 system at 0. This change is not backward compatible. Post-test damage from test P7 is shown in Figure 91. Parapet damage after test P5, rear. Initial blank mesh and formed blank mesh can be different e.

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