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ANSYS Users Group Meeting
Tuesday, September 28th, 8:30am - 4:00pm
Customer Presentation Abstracts:
An Integrated Approach for Stress-Life Methodology
Michael Urban, Chief Structural Methods & Prognostics, Sikorsky Aircraft
Many current fatigue calculations utilize stress-life methods that have evolved over the many years, but with techniques, limitations, and assumptions that today may no longer apply. This work presents an integrated approach which unites existing published data, incorporates current test data, applies current computer methods and abilities, and expands statistical scatter and probability in life predictions. The stress-life technique reduces or eliminates analysis assumptions allowing for very uniform fatigue predictions and a more seamless integration with damage tolerance analysis.
Simulation Driven Advanced CMOS Chip Package Qualification
Xiao Hu Liu, Research Staff Member, IBM TJ Watson Research Center
The product development of advanced low dielectric constant CMOS chip and flip-chip plastic package takes a long time from unit process to final product qualification on both the chip and the package side and the final assembly of them. Based on prior product qualification, potential thermo-mechanical problems can be identified and simulated to understand the impact of the scaling of the chip and package, thereby helping to accelerate the product development. In this talk we will present some examples where ANSYS has been used to analyze and understand the impact of dielectric mechanical properties on failure modes related to structural instability, dielectric cracking, and delamination.
Macro for Automatically Applying Bolt Bearing Loads to Fastener Holes
Kevin Smalley, Stress Analyst, ITT Corporation, Defense Systems
Fatigue analysis requires an accurate stress estimate inside fastener holes. Using constraint equations in fastener holes to connect parts will provide the loads in the fastener hole but the stresses will not be accurate. A macro was developed that will allow the user to quickly replace the constraint equations with pressure loads to create an equivalent and balanced model that can then be used to obtain accurate stresses inside the fastener hole.
Vibration Analysis of a New Orleans Stormwater Pumping Station
Bill Kelly, Principal Engineer, Mechanical Solutions Inc.
After Hurricane Katrina in 2006, New Orleans rapidly increased its stormwater pumping capacity by constructing several massive pumping stations. The vibrational behavior of the 17th Street Canal Station was simulated in an effort to identify detrimental resonant conditions of the steel truss structure.
Heat Transfer with Change of Phases in Continuous Casting
Ernesto Gutierrez-Miravete, Associate Professor, Rensselaer at Hartford
A commonly used method for the production of industrial metals involves controlled heat removal from a molten mass of material to produce solidification. In continuous casting, molten metal is poured into a hollow, water-cooled mold resulting in the formation of a solidified skin encasing the remaining molten mass. As the solid skin thickens with increasing contact time with the mold, it acquires sufficient strength to sustain pulling from the other side of the mold. As a result, a partially solidified ingot or slab emerges from the mold. Direct water-cooling on the solidified shell is employed until the center of the slab has fully solidified. The end objective is to produce high quality solid slabs with high yield and at the fastest possible rate. The presentation describes the development of a number of finite element models of heat transfer and solidification in industrial continuous casting process used in the production of steels and copper alloys. The capabilities and limitations of the FEM, encountered in the analysis of these systems, will be discussed.
The Use of Miles Equation As Part of Random Vibration Fatigue Analysis
Dan Griffin, Director of Engineering, Design Automation Associates
The use of Miles Equation as part of Random Vibration Fatigue Analysis has been successfully applied for years. However, vibratory stress predictions for systems with closely spaced modes using Miles Equation may be non-conservative due to mode coupling. Comparisons were performed using the Miles Equation and ANSYS Random Vibration methods for 2- DOF geometries and with a real electronic chassis assembly. This presentation will summarize the analytical results and observations, as well as provide some conclusions.
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