Unitized Structural Body Repair Exam Study Guide Solutions

Unitized Structural Body Repair Exam Study Guide Solutions Unibody - ANSWER-Lightweight stamped sheet metal components that are welded to each other to create a single unit. Space Frame - ANSWER-Body panels can be made from plastic are steel. Steel may be Mild, Intermediate, or HSS. Panels may hide damage to frame or structure. Crush Zones - ANSWER-Structural components such as rails are designed to collapse and bend at specific points. Collision Energy Management - ANSWER-Goal is passenger protection. Front and rear structures act as crush-able energy absorbers. Direct Damage - ANSWER-POI. Easily located and diagnosed. Indirect Damage - ANSWER-transmission of collision energy beyond the area of immediate impact. Examples; Split seam sealers, pulled spot welds, misaligned panels, buckles in steel, cracked glass, and cracked or chipped paint. Passive Restraint Systems - ANSWER-Must have service manual. No two are alike. Datum - ANSWER-Imaginary plane or line beneath the vehicle. Measures height. Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024 Copyright ©Stuvia International BV Page 2/9 Centerline - ANSWER-Vertical plane that passes from the front of the vehicle to the rear. Measures Width. May have stamped marks on vehicle body structure. Is confirmed by referencing at last 3 width measurements in the undamaged portion of the vehicle. Zero Planes - ANSWER-Vertical plane that passes from side to side. Confirmed by measuring 3 length measurements from the undamaged portion of the vehicle. Symmetry - ANSWER-Equal on each side of the vehicle. Asymmetrical - ANSWER-Unequal on each side of the vehicle. (spare tire well) Reference Points - ANSWER-Bolts or nuts, Holes, Mechanical attachment points, Edges of panels, Door strikers, Corner of openings. Common tolerance is =/.3mm (1/8) or all the way to 1mm (1.32). Loaded Measurements - ANSWER-Drivetrain In Unloaded Measurements - ANSWER-Drivetrain out Point to Point Measurements - ANSWER-shortest distance between 2 reference points. AKA "as the crow flies". Uses tram or steel tape measure. Datum Measurements - ANSWER-Taken at Datum plane, height differences between reference points. Laser measuring system Computerized Measuring System - ANSWER-compare data stored in a software program or a central database. Get hard copy of measurements. Can watch while pulling. Steel - ANSWER-Cannot know what kind by visible. Must check service manual. Tensile Strength - ANSWER-Amount of pressure/force necessary to fracture or tear steel. Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024 Copyright ©Stuvia International BV Page 3/9 Yield Strength - ANSWER-Amount of force/pressure necessary to deform steel permanently. PSI - ANSWER-Pounds per inch /// tensile and yield strengths are expressed. Higher the number the stronger the steel. Mild Steel - ANSWER-Cosmetic, used on Space frames, May be stressed relieved with heat, tears can be welded without a loss of strength. Yield strength 30,000 PSI Intermediate Steel - ANSWER-Yield strength 30,000-70,000 PSI, structural and cosmetic, may be affected by excessive heat, small tears can be welded w/o loss of s