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Page  159 of 187    159 160 161 162 163
Conference Papers

Structural Analysis of Human Body Impact

The impact of firing a rifle on the human body is affected by human posture. The human model of shooting posture is defined by the action of the shooter. The shooting impact of the rifle is transferred to the human model. In this study a finite element analysis has been performed in order to investigate the impact on a human body of shooting a rifle. The model (height 170 cm, weight 60 kg) is developed by the finite element method using beam elements. The human body impulse is analyzed by the ANSYS 8.1 code. The human impact analysis of a standing shooting posture, shooting from a kneeling posture and prone shooting posture are investigated. In this study, the rifle used for the impulse analysis is a K2. The applied load for the simulation inputs is about 4 kN. In the results, the displacement and stress on the human body is presented.

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Conference Papers

Use of Coupled Field FE Modeling in Study of Resistive Heating in a 6061-T6511 Aluminum Specimen

The effect of electric current on material mechanical properties has been of interest since it can reduce the mechanical energy associated with cutting/machining a material. An ANSYS model is used to evaluate the distribution of temperature resulting from the dissipation of electrical energy in a cylindrical tensile bar of 6061-T6511 aluminum while the specimen is carrying a large DC current. The simulation results are compared to surface infrared temperature measurements in order to (1) refine and verify the FE model, and (2) offer more qualitative insight into the effects of electric field.

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Conference Papers

Thin-Wall Structure Simulation

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Conference Papers

Thermoelectric Modeling of Microprocessor Socket Assemblies to Predict Current Carrying Capacity – A Parametric Approach

Higher microprocessor speeds and power have lead to higher contact pin currents during package testing. Intel, in collaboration with PADT, has developed a sophisticated, parametric microprocessor burn-in simulation tool using APDL scripts, Excel Macro’s, and the ANSYS optimizer. The unique programmatic construction of the thermo-electric model minimizes element count of a model containing a microprocessor package, contact pins, and a PCB. The contact pin construction technique captures critical details by importing IGES files and allows the user to specify contact area and tip resistivity as independent variables. This development tool captures Joule heating and 3D conduction effects throughout the global model. What-if scenarios and design exploration was performed in batch mode as most key parameters are input with a single text file. This simulation tool, correlated to test data, allows engineers to predict effects of burn-in temperatures and current on contact pins to prevent thermal degradation of testi hardware.

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Conference Papers

Two Dimensional Elasto-Viscoplastic Analysis Using Finite Element Method

The time-dependent behavior of metals is modeled in a simple manner by using the constitutive equations of elasto-viscoplastic behavior together with the linear strain-hardening. The finite element method (FEM) is used for solving the presented mathematical model by using the ANSYS software. The presented mathematical model is studied by using a rectangular metallic perforated strip with loading varying in its type and value. The study includes the relaxation process and the response of the model at the yielding and failure regions in the stress and strains curves and the effects of some factors on these behaviors like tangent modulus and fluidity parameter. It's found that the value of the applied tensional stress that causing failure in elasto-plastic behavior is (T=123 N/mm2) while it is (T=130 N/mm2) in elasto-viscoplastic behavior at ramp load. In another hand the time required for reaching steady state in relaxation process is (t ≈ 7 min) at (T=80 N/mm2) and it is not affected by changing the value of tangent modulus but it changes during the changing of fluidity parameter value.

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Conference Papers

System Level Design and Analysis of the ACES Modular Ejection Seat

McDonnell Douglas originally developed the Advanced Concept Ejection Seat (ACES II) in the 1970’s. The USAF has contracted Goodrich Universal Propulsion Company (UPCO) and Concurrent Technologies Corporation (CTC) to develop a modular version of ACES for the F-15. The modular design will allow seat removal without having to first remove the canopy from the aircraft. ANSYSTM Workbench 9.0 shaped the modular design, enabling CTC to meet the demanding structural requirements for the new seat. Due to the complex loads this seat is subjected to, a system level analysis was developed. This linear analysis consists of approximately sixty structural components, uses a mixture of shell and solid elements and consists of approximately 320,000 nodes and 200,000 elements. Bonded contact was used to join the components together. This model allowed CTC to quickly and efficiently examine the effects of many load cases on the entire seat system when problem areas were identified and the geometry could be updated without eras ing existing contact pairs, loads and boundary conditions. The ability to easily update and quickly solve the numerical model allowed for multiple iterations, resulting in an optimized design. The system analysis also allowed CTC to examine complex load cases, which were not possible during the original design in the 1970’s. Modifying and verifying multiple designs were easily accomplished using ANSYS Workbench. This approach ensures that the new modular design will meet all requirements during structural testing and qualification.

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Conference Papers

Tundish Optimization

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Conference Papers

The Dynamic Characteristics Analysis of Rotor Blade Based on ANSYS

The three-dimension finite element model of helicopter rotor blade has been built with APDL language. Then using this model, the static strength and the dynamic characteristics about rotor blade has been analyzed with ANSYS software package. During the analysis of dynamic characteristic, the influence of aerodynamic force and centrifugal force applying to blade has been totally considered. Furthermore, the resonant chart of rotor blade has been presented in this paper.

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Conference Papers

Some Aspects for the Simulation of a Non-linear Problem with Plasticity and Contact

A linear elastic model is often not appropriate for numerical simulations of conformed mechanical components. Such processes have large permanent deformations, and require material models that account for the relationship between stress and strain, along with the influence of temperature and strain rate. Important parameters are mesh quality, solver type, contact behavior, boundary conditions and the material model. Also, when the properties are unknown and the data available in the literature is inadequate, lab tests are indispensable. The easiest and most common test is the tension test. It provides information, such as stress-strain curve, Young modulus, yield and ultimate stress. This work proposes to analyze numerical results using MISO and BISO models, with experimental data from a tension test. This problem involves compressing a cylinder against two flat surfaces. It is validated with actual tests, where the load versus axial and radial displacement are measured during load application and elastic return. The importance of the contact method, element type and size are evaluated with respect to final deformation and CPU time.

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Conference Papers

The Dynamic Tightening of a Bolted Joint

In an assembly that contains threaded fasteners, the nut or bolt needs to be physically tightened to a specific torque. This is usually performed with a torque gun operating at a specific speed to drive the fastener to the final torque target. This type of tightening process is considered “dynamic” in the fastener community. The act of dynamically tightening a fastener creates tension in a bolt, clamp-load in the jointed members, and a complex set of shear stresses in the under-head region as well as in the engaged portion of the threads of the fastener. FEA models of fasteners are usually created without these internal and external threads (without a helical thread path). The clamp-load is then created in the FEA joint with the aide of pre-tension elements and not through the application of a physical torque. Analysis conducted with the aide of these pre-tension elements thus needs to be considered “static”. These elements not only fail to produce the actual shear stresses, but also do not accurately depict the deflection and plastic deformation in both the bearing surface and engaged threads of the fastener when non-linear material properties are used. A new type of bolted joint model has been developed which allows for the dynamic tightening of a bolt into a threaded through-hole using non-linear material models and a helical thread path. This model was patterned after an actual joint created in a test laboratory. The thread and under-head coefficients of friction were measured from the actual joint and were then used as inputs for the new model. Comparison of the clampload results from the model and the actual joint showed a 0.15% difference when 50 deg of rotation was applied to both the actual and FEA bolts. The average plastic deformation on the bearing surface of the joint from the model matched that of the actual joint, 0.003 mm. The pretension model showed no evidence of plastic deformation on the bearing surface however.

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Page  159 of 187    159 160 161 162 163