ASME RT-1:2015 pdf free download

ASME RT-1:2015 pdf free download.Safety Standard for Structural Requirements for Light Rail Vehicles.
average collision acceleration: the average computed longitudinal acceleration at the vehicle center of gravit The average computed acceleration is evaluated over the period of time from first contact between colliding vehicles to the time when the contact force between vehicles first returns to a magnitude of im.
belt rail: a longitudinal structural member of the carbody located on each side of the carbody below the passenger side windows. The belt rail often establishes the overall width of the carbody, exclusive of the side door thresholds and the side cameras and mirrors.
carbody: the vehicle body comprising its main load-carrying structure above all truck suspension units. It includes all components and structural articulation parts, if any, that are connected to this structure and contribute directly to its strength, stiffness, and stability Mechanical or electrical equipment and other mounted parts are not considered part of the carbod> though their attachment brackets are. The “coupler” ends of the carbody are the outside vehicle ends that contain the means for coupling to another vehicle. The “intermediate” ends, if any, contain the articulation system.
closing speed: the speed of a vehicle relative to another obfrct or vehicle at the time of initial impact.
collision posts: a set of two structural posis located at each end of the carbody, extending from the bottom of the underframe structure up to the structural shell. Collision posts can be made of several structural members assembled to each other, provided that the required performance is met. They are located at the approximate one-third points across the width of the vehicle, and are forward of the seating position of any passenger or crew person. An alternative to collision posts is the use of a collision wall.
collision wall: a structure at the leading end of the vehicle spanning the area between the structural shelf, corner posts, and top of the underframe.
consist: the makeup or composition of the individual units of a train, generally by number of cars and type of vehicle.
corner posts: a set of two full-height structural posts located at or near the two corners at one end of the carbody, extending from the bottom of the underframe
The test procedure should include, as a minimum, the drawings, sketches, tables, and other descriptions that provide a description of the test load equipment, the location of each point at which a load or reaction is applied to the specimen, a table showing the load applied at each load point for each test increment, and the location of each load, strain, and deflection- measuring device. The force of the testing machine shall be measured by a load cell or equivalent device that is independent of the equipment producing the applied force.
10.3 Proof Load Tests
10.3.1 Test Procedures. Tests shall be conducted on a hare carbody, following its manufacture, that has been ballasted or otherwise loaded with properly distributed weight such that the carbody’s weight is equivalent to that of a fully assembled ready-to-run vehicle. The tests shall be carried out in a test fixture that allows for the application of reaction forces at the points where they would occur during operation. All test measurement devices shall be verified to be within calibration. The carbody and applicable articulation system shall be equipped with strain-measuring devices in locations that will allow estimation of maximum stresses predicted by the stress analysis, in areas of stress concentration factors as determined by the stress analysis or finite element analysis Testing shall be capable of addressing the following conditions and measurement points:
(a) the strain at critical points, including window and door corners, side sill, corner and collision posts, structural shelf, and other areas
(I’) deflection of carbody
(C) diagonal dimensions at window and door openings
(d) residual deflection of carbody
(e) residual strain, if any
The carbody shall be preloaded before the load tests as agreed to between the customer and the manufacturer, to stabilize the overall structure, and the maximum force shall then be applied incrementally at least twice. The customer shall approve the results of the last test. These tests shall verify that there is no permanent deformation to the carbody or individual elements when subjected to the loads identified in section 5 regarding permanent deformation.
10.3.2 Vertical Load
10.3.2.1 Test Description. The carbody, supported on trucks or a simulation thereof, shall be subjected to a vertical load test.