Euro NCAP has been developing a new car-to-car frontal offset crash test protocol including crash compatibility assessment. The current frontal offset test called ODB (Offset Deformable Barrier) test will be substituted by the new test in 2020. This new test uses a new barrier called MPDB (Mobile offset Progressive Deformable Barrier). The anthropomorphic test device (ATD) in the front seats will be changed from Hybrid-III 50th percentile male to THOR (Test Device for Human Occupant Restraint) 50th percentile male.

In this paper, two full car-to-car crash tests have been conducted. A THOR 50th percentile male dummy in the driver position and a Hybrid-III 50th percentile male dummy were seated in the front passenger position. Also, Q6 and Q10 were seated in the rear position. The test results are consisted of vehicle responses, occupant responses and crash compatibility assessment. In the second MPDB test, additional restraint systems are used to improve occupant response. The crash compatibility is assessed by standard deviation of the barrier intrusion, energy absorption and delta-V of the MPDB.

In the vehicle responses, the crash severity was increased as the relative impact speed comparison with ODB test. The vehicle deformation and Y-direction movement were similar with ODB test, but the vehicle body pulse severity was increased remarkably. The crash event timing of MPDB was faster than ODB test. So this pulse severity was similar to the full frontal impact at 50km/h.

In the occupant responses, most of injury criteria were increased. Especially, the chest compression values of front seats were significantly increased because of increased body pulse severity and THOR dummy’s multi- point measurement system. In the second MPDB test, the improvement possibility of the chest compression value was identified, so it needs a study of the additional optimization method such as CAE and sled test.

In the crash compatibility assessment, final ratings were bare minimum. The causes of this result were the fracture of the front-end beam and the poor deformation of the front side member. In order to improve the crash compatibility, it needs the improved structure such as the body structure using the multi-load path system which helps distributing crash energy to various sub-structures.