• Dodds, Robert H.
• Mach, Justin C.
• Hattery, Garty R.
• Twombly, Elizabeth Kurth
• Kalyanam, Suresh
• Brust, Frederick W.
• Punch, Edward F.
• Kennedy, James
• Gohar, Basil M.
• Chalker, Alan
• Nicklas, Jeremy
• Hudak, David

Abstract

This report summarizes the final product developed for the US DOESmall Business Innovation Research (SBIR) Phase II grant made to Engineering Mechanics Corporation of Columbus (Emc²) between April 16, 2014 and August 31, 2016 titled ‘Adoption of High Performance Computational (HPC) Modeling Software for Widespread Use in the Manufacture of Welded Structures’.Many US companies have moved fabrication and production facilities off shore because of cheaper labor costs.A key aspect in bringing these jobs back to the US is the use of technology to render US-made fabrications more cost-efficient overall with higher quality.One significant advantage that has emerged in the US over the last two decades is the use of virtual design for fabrication of small and large structures in weld fabrication industries.Industries that use virtual design and analysis tools have reduced material part size, developed environmentally-friendly fabrication processes, improved product quality and performance, and reduced manufacturing costs.Indeed, Caterpillar Inc. (CAT), one of the partners in this effort, continues to have a large fabrication presence in the US because of the use of weld fabrication modeling to optimize fabrications by controlling weld residual stresses and distortions and improving fatigue, corrosion, and fracture performance. This report describes Emc²’s DOE SBIR Phase II final results to extend an existing, state-of-the-art software code, Virtual Fabrication Technology (VFT®), currently used to design and model large welded structures prior to fabrication - to a broader range of products with widespread applications for small and medium-sized enterprises (SMEs).VFT® helps control distortion, can minimize and/or control residual stresses, control welding microstructure, and pre-determine welding parameters such as weld-sequencing, pre-bending, thermal-tensioning, etc.VFT® uses material properties, consumable properties, etc. as inputs.Through VFT®, manufacturing companies can avoid costly design changes after fabrication.This leads to the concept of joint design/fabrication where these important disciplines are intimately linked to minimize fabrication costs.Finally service performance (such as fatigue, corrosion, and fracture/damage) can be improved using this product. Emc²’s DOE SBIR Phase II effort successfully adapted VFT® to perform efficiently in an HPC environment independent of commercial software on a platform to permit easy and cost effective access to the code.This provides the key for SMEs to access this sophisticated and proven methodology that is quick, accurate, cost effective and available “on-demand” to address weld-simulation and fabrication problems prior to manufacture.In addition, other organizations, such as Government agencies and large companies, may have a need for spot use of such a tool.The open source code, WARP3D, a high performance finite element code used in fracture and damage assessment of structures, was significantly modified so computational weld problems can be solved efficiently on multiple processors and threads with VFT®.The thermal solver for VFT®, based on a series of closed form solution approximations, was extensively enhanced for solution on multiple processors greatly increasing overall speed.In addition, the graphical user interface (GUI) was re-written to permit SMEs access to an HPC environment at the Ohio Super Computer Center (OSC) to integrate these solutions with WARP3D.The GUI is used to define all weld pass descriptions, number of passes, material properties, consumable properties, weld speed, etc. for the structure to be modeled.The GUI was enhanced to make it more user-friendly so that non-experts can perform weld modeling. Finally, an extensive outreach program to market this capability to fabrication companies was performed.This access will permit SMEs to perform weld modeling to improve their competitiveness at a reasonable cost.

Topics

• impedance spectroscopy
• microstructure
• corrosion
• phase
• simulation
• fatigue
• positron annihilation lifetime spectroscopy
• Photoacoustic spectroscopy