Cadalyst - September 2007 - (Page 15) techtrends Figure 3. The Purdue team used the Riera curve, an algorithmic summation of the energy distribution in airplane collisions, to study (top) the moment of impact and (bottom) immediately after impact. When you heat a steel structural column to 600 to 700 degrees Celsius, though it doesn’t melt, its strength and stiffness decrease to a small fraction of their roomtemperature values. In other words, it becomes extremely weakened and has less capacity to carry the load. If that happens in an element supporting loads based on its original strength (with an appropriate factor of safety), the element fails.” be less critical compared with others, such as how much of the [plane’s] fuel dissipated outside, how much inside, and how much on the other side [of the building].” The Cost of Fame Since the animation was released, the Purdue team has received many phone calls from speculative filmmakers and authors who want them to confirm one theory or disprove another. Hoffmann and his colleagues welcome legitimate input, such as the eyewitness who wrote to them to say, “I was there when it happened. I don’t remember the fireballs coming out on the far side like you’re showing them.” At the same time, they’re trying hard not to get tangled up in the works of conspiracy theorists. c Kenneth Wong is a former editor of Cadence magazine. As a freelance writer, he explores innovative usage of technology and its implications. E-mail him at Kenneth.Wong at cadalyst.com. The Unknown “One of the shortcomings of the simulation is that the dispersing fuel is treated by LS-DYNA as a nonvolatile liquid,” the team noted. “However, [the impact] created an explosion and subsequent fire . . . This and other firerelated effects should be revisited in future work.” Hoffmann confessed that certain issues are difficult to address. “For example, the layout of the partitions, the materials of the partitions, their sturdiness, the distribution of the furniture — all those could have slowed down the impact and altered the fuel dispersal. Some [of those] may www.cadalyst.com | cadalyst | September 2007 15 http://www.cadalyst.com
Table of Contents Feed for the Digital Edition of Cadalyst - September 2007 Contents Editor's Window Techtrends: Resurrecting an Unforgettable Second Living Large UGS Solid Edge v20 Adobe Acrobat 3D v8 Adobe Photoshop CS3 Extended CAD Manager: Managing 2D and 3D in the Same Office MCAD Modeling: Where is MCAD Going? AEC in Focus: Automated Estimating and Scheduling Using BIM CAD Cartoon Issue Indexes CADfidential Cadalyst - September 2007 Cadalyst - September 2007 - (Page FC1) Cadalyst - September 2007 - (Page FC2) Cadalyst - September 2007 - (Page Cover1) Cadalyst - September 2007 - (Page Cover2) Cadalyst - September 2007 - (Page 3) Cadalyst - September 2007 - Contents (Page 4) Cadalyst - September 2007 - Contents (Page 5) Cadalyst - September 2007 - Contents (Page 6) Cadalyst - September 2007 - Contents (Page 7) Cadalyst - September 2007 - Editor's Window (Page 8) Cadalyst - September 2007 - Editor's Window (Page 9) Cadalyst - September 2007 - Editor's Window (Page 10) Cadalyst - September 2007 - Editor's Window (Page 11) Cadalyst - September 2007 - Techtrends: Resurrecting an Unforgettable Second (Page 12) Cadalyst - September 2007 - Techtrends: Resurrecting an Unforgettable Second (Page 13) Cadalyst - September 2007 - Techtrends: Resurrecting an Unforgettable Second (Page 14) Cadalyst - September 2007 - Techtrends: Resurrecting an Unforgettable Second (Page 15) Cadalyst - September 2007 - Living Large (Page 16) Cadalyst - September 2007 - Living Large (Page 17) Cadalyst - September 2007 - Living Large (Page 18) Cadalyst - September 2007 - Living Large (Page 19) Cadalyst - September 2007 - Living Large (Page 20) Cadalyst - September 2007 - Living Large (Page 21) Cadalyst - September 2007 - Living Large (Page 22) Cadalyst - September 2007 - Living Large (Page 23) Cadalyst - September 2007 - Living Large (Page 24) Cadalyst - September 2007 - Living Large (Page 25) Cadalyst - September 2007 - Living Large (Page 26) Cadalyst - September 2007 - Living Large (Page 27) Cadalyst - September 2007 - UGS Solid Edge v20 (Page 28) Cadalyst - September 2007 - UGS Solid Edge v20 (Page 29) Cadalyst - September 2007 - UGS Solid Edge v20 (Page 30) Cadalyst - September 2007 - UGS Solid Edge v20 (Page 31) Cadalyst - September 2007 - Adobe Acrobat 3D v8 (Page 32) Cadalyst - September 2007 - Adobe Acrobat 3D v8 (Page 33) Cadalyst - September 2007 - Adobe Acrobat 3D v8 (Page 34) Cadalyst - September 2007 - Adobe Photoshop CS3 Extended (Page 35) Cadalyst - September 2007 - Adobe Photoshop CS3 Extended (Page 36) Cadalyst - September 2007 - CAD Manager: Managing 2D and 3D in the Same Office (Page 37) Cadalyst - September 2007 - CAD Manager: Managing 2D and 3D in the Same Office (Page 38) Cadalyst - September 2007 - CAD Manager: Managing 2D and 3D in the Same Office (Page 39) Cadalyst - September 2007 - MCAD Modeling: Where is MCAD Going? (Page 40) Cadalyst - September 2007 - MCAD Modeling: Where is MCAD Going? (Page 41) Cadalyst - September 2007 - MCAD Modeling: Where is MCAD Going? (Page 42) Cadalyst - September 2007 - MCAD Modeling: Where is MCAD Going? (Page 43) Cadalyst - September 2007 - MCAD Modeling: Where is MCAD Going? (Page 44) Cadalyst - September 2007 - AEC in Focus: Automated Estimating and Scheduling Using BIM (Page 45) Cadalyst - September 2007 - AEC in Focus: Automated Estimating and Scheduling Using BIM (Page 46) Cadalyst - September 2007 - AEC in Focus: Automated Estimating and Scheduling Using BIM (Page 47) Cadalyst - September 2007 - AEC in Focus: Automated Estimating and Scheduling Using BIM (Page 48) Cadalyst - September 2007 - Issue Indexes (Page 49) Cadalyst - September 2007 - Issue Indexes (Page 50) Cadalyst - September 2007 - Issue Indexes (Page 51) Cadalyst - September 2007 - CADfidential (Page 52) Cadalyst - September 2007 - CADfidential (Page Cover3) Cadalyst - September 2007 - CADfidential (Page Cover4)
For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.