Project: ES2 Back Plate Testing

Reference: S0051/VC

Last update: 26/08/2003 12:36:51


The objective of this research is to confirm that the low shear force back plate will eliminate the spinal-load path and not change the biofidelity of the amended dummy.


It has been noticed in some EuroNCAP side impact tests that a load path was formed between the side impact dummy's back plate and parts of the vehicle such as the car seat and door pillar. It has been shown that load transferred via this load path can reduce the dummy rib loadings, which could result in an under-estimation of the chest injury criteria and ultimately lead to an incorrect assessment of the car's safety performance.

The current UNECE Regulation 95 does not require the measurement of back plate loads and only assesses the severity of impact to the thorax through rib deflection measurements. EuroNCAP has suggested that vehicle manufactures are using the rigid load path through the spine back plate to reduce the severity of thoracic injury assessment. A simple and acceptable solution has been proposed to eliminate this spinal load path by introducing a low shear force back plate, thus allowing the full force to be measured through the rib deflection. This project is to undertake some baseline comparative tests to show that the modification does not change the biofidelity of the amended dummy.


TRL Limited
Crowthorne House, Nine Mile Ride, Wokingham, Berkshire, RG40 3GA
+44 (0)1344 773131

Contract details

Cost to the Department: £13,800.00

Actual start date: 18 April 2001

Actual completion date: 31 December 2001


PR/SE/406/01. ES2 Back-plate tests
Author: TRL Ltd
Publication date: 30/11/2001
Source: Contact
More information:

Summary of results

  1. The research arrives at a number of conclusions indicating that the shearing back-plate does not alter the biofidelic performance of the ES-2 dummy and that the modified back plate shears under nominal loading. As no biomechanical data exists for spinal shear, it is suggested that the shearing back-plate would be a suitable alternative to an instrumented standard back-plate.