University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 To be held on Friday October 15, at Visions Lab (ECAE 1B73) - No recitations that day. Use Buff One card to get in 24/7 (but need account). Attendance recommended but not required Demo is a hands-on, self-learning (individual) tutorial. Once in, sit at any empty computer and try logging in. ANSYS tutorial available on public web site: Homepage scrolldown-> Lab Information in both PDF and DOC formats ANSYS Demos for Computer Portion of Lab 2

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Because of limited seating (physically 25 workstations but only 23 are operational) the demo will be divided into four roughly-one-hour subsections Sec 011: 10 and 11PM Sec 012: 1 and 2PM Student distribution on next slide Demo Times

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Section 013 (10-11:50AM) Splitting A-N 10 AM O-Z 11 AM

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Section 012 (1-2:50 M) Splitting A-L 1 PM M-Z 2 PM

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Note: members of a group need not attend the same demo subsection, since the tutorial is individual No Grouping Necessary

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 A Short Pictorial Introduction to FEM

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 such as beams, ribs and spars, were sufficient for modeling low aspect ratio aircraft structures (e.g. Lockheed Constellation, pictured on left) Before 1950, standard structural elements

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall starting about 1952 as a modeling tool to simulate delta wing military aircraft on digital computers Digital computers began to be commercially sold by Only aerospace companies and some government agencies could afford them (a vacuum-tube monster weighting several tons cost the equivalent of $100M today) The modern FEM was developed...

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Most of the pre-1960 work was done at a few places

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 A key 1956 paper described the DSM as used today

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall but it had a marketing problem: no brand name The method was well on its way by 1960

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Name was coined by Ray Clough in 1960

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 b. 1921, Washington state served in Air Force during WWII Ph.D. Aero & Astro MIT, 1950 joined Civil Engrg faculty at UC Berkeley, 1951 avid mountaineer & skier (holds many climbing records) Ray Clough’s early career I

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 spent summers at Boeing at Jon Turner’s group so he could go mountain climbing on weekends modern FEM started by 1956 JAS paper by Turner, Clough, Martin & Topp back at Berkeley, became interesting in Civil applications, especially earthquake engineering formed active FEM research group in 1958 Ray Clough’s early career II

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 First Civil structure analyzed by FEM (1962)

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall Ray with Kurt Gerstle (his 1st student) on left pic

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 gave up FEM research in 1972 for seismic engineering head of NSF Earthquake Engineering Center at Richmond, CA, retired from Berkeley 1987 honored with National Medal of Science, 1994 Ray Clough’s late career

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 An Unimpeachable Gentleman

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 By 1970, FEM (DSM) had taken over computational mechanics and was expanding beyond structures Some samples follow Explosive Success...

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012

F-16 Structural Model

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall % of elements are HPSHEL3 18 DOF shells F-16 Exterior Surface Zoom

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Some solid elements (bricks & tets) used for “wing fingers ” F-16 Interior Structure Zoom

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Liquid Natural Gas (LNG) Ship - Global FEM Model

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Stepwise Construction of Global Model

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 “Hot Spots “ Detailed Local Models

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Wave Motion and Hull Pressures

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall m high including superstructure m3 of concrete tons of steel reinforcement Design life of 50 years Largest man-made object ever moved Supplies 10 percent of Europe’s gas consumption The Troll Platform

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Floating TLP Platform Made of reinforced concrete 16 vertical anchoring lines (tethers) of pre-tensioning Transverse stiffness supplied by secondary geometric effects The Heidrun Platform

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Last But Not Least...

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall bay Truss for Lab #2: FEM Model

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 Idealization Process

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 FEM-DSM Breakdown

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 FEM-DSM Assembly & Solution

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 The Example Truss

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012 The Truss Example

University of Colorado - Intro to Aerospace Structures (ASEN 3112) - Fall 2012