History of Crash Testing
Crash testing provides a structured procedure to establish a penetration rating for perimeter barriers subjected to a vehicle impact. Knowing the penetration rating provides the ability to select an appropriate barrier for site-specific conditions around a facility.
The barrier penetration rating does not imply that a barrier will perform as rated in all site conditions, approach routes, and topography. Also, only single-specimen tests at a specified impact location are required by this test method, and therefore, not all points of impact can be tested and validated for the penetration rating. Other impact locations may respond differently.
2. Compliance with these procedures establishes a measure of performance but does not render any perimeter barrier invulnerable to vehicle penetration. Caution should be exercised in interpreting any test findings and in extrapolating results to other than actual crash test conditions. While computer simulations are powerful tools that are useful in the development of new and improved barriers or in estimating performance under differing conditions, it is suggested that engineering calculations should also be considered along with specific site conditions. When assessing a crash rating, developers and users are encouraged to address specific or unusual site conditions as needed. Often local terrain features, soil conditions, climate, or other items will dictate special needs at specific locations. Therefore, if site conditions have not ben carefully considered for a barriers performance, the end user in need of a perimeter barrier system should require professional evaluation by a perimeter defense specialist of all factors, including possible run up speeds to ensure that a higher rated barrier than is really necessary is not included in a specification. Most customers are unaware of the considerable price difference that exists between a ASTM-M30 and ASTM-M50 rated equipment. In most cases it can be as much as double!
3. Product/design certification using any test method can only addresses the ability of the barrier to withstand the impact of the specified vehicle. It does not represent an endorsement of the product/design or address its operational suitability under all conditions.
4. The consideration of possible vehicle penetration should also be of primary concern and it is recommended that a perimeter defense specialist be consulted to assist with barrier selection.