SAE J2420-1998 COE Frontal Strength Evaluation.Dynamic Loading Heavy Trucks.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1998 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J2420 ISSUED JAN1998 Issued1998-01 COE Frontal Strength EvaluationDynamic Loading Heavy Trucks 1.ScopeThis SAE Recommended Practice describes the test procedures for conducting dynamic frontal strength test for COE heavy truck applications. Its purpose is to establish recommended t
5、est procedures which will standardize the procedure for heavy trucks. Descriptions of the test set-up, test instrumentation, photographic/video coverage, and the test fixtures are included. 2.References 2.1Applicable PublicationsThe following publications form a part of the specification to the exte
6、nt specified herein. Unless otherwise indicated the latest revision of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J211-1Instrumentation for Impact TestElectronic Instrumentation SAE J211-2Instrumentation for Impact Te
7、stPhotographic Instrumentation SAE CRP-9“Heavy Truck Crashworthiness (Statistics, Accident Reconstruction, Occupant Dynamics Simulation)“, March 1995. SAE CRP-13“Heavy Truck Crashworthiness (Phase III),“ November 1996. 3.Definitions 3.1PlatenA structurally stiff, flat plate. 3.2Cab MountThe componen
8、t or components used to connect the cab to the chassis frame rails. 4.Test ConfigurationThe COE frontal strength test is designed to evaluate the resistance of a COE vehicle in an impact into the rear of a heavy truck trailer. The rear of the trailer is simulated as a rigid surface. With the cab att
9、ached to the ground through its cab mounts, a platen is forced to longitudinally move into the cab with the inertia of the platen and the structure carrying it. This loading configuration is shown in Figure 1. SAE J2420 Issued JAN1998 -2- FIGURE 1COE FRONTAL STRENGTH TEST CONFIGURATION 4.1Cab Mounti
10、ngThe cab shall be evaluated with its standard cab mounts. The cab mounts shall either be mounted to the vehicles stock frame rails or to a simulated chassis that locates the cab mounts in their standard location and orientation. If testing is conducted using actual frame rails, the frame rails shal
11、l be rigidly attached to the ground. The forward attachment to the ground shall be not less than 15 cm (6 in) rearward of any front bumper or cab mounting hardware. If a simulated chassis is used, it shall not deform during the test. Hardware used to attach the cab mounts to the simulated chassis sh
12、all be the same type and strength as the standard hardware used to attach the cab mounts to the standard chassis. Cab mounts employing pneumatic ride control should be pressurized to produce the manufacturer recommended ride height. If the influence of the engine is to be included in the evaluation,
13、 it must be attached to the frame rails or simulated chassis with the stock mounting hardware. Space should be provided to allow for movement of the engine and transmission without interference with the test fixture or simulated chassis. 4.2PlatenA rigid platen simulates the rear of a heavy truck tr
14、ailer. The height of the bottom of the platen is defined by the position on the cab that would first contact the lower structure of a trailer. For the vehicle at curb conditions, the position on the front of the cab 117 cm (46 in) above the ground defines the height of the platen. This is shown in F
15、igure 2. The platen should be tall and wide enough so that the entire front of the cab is engaged, up to a width of 259 cm (102 in). The face of the platen is to be covered with a 19 mm (3/4 in) thick layer of plywood. The combined weight of the platen and structure that carries it shall be 2268 to
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