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| rdfs:comment | - In the late 1960s, a weak point and location of structural failure in catastrophic school bus crashes was considered to be body joints, the points where panels and pieces were fastened together. Longitudinal steel guard rails had been in use since the 1930s to protect the sides of buses, but behind them on the sides and on the roofs, manufacturers used many individual panels to construct a bus body.
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| assembly | - Marysville, Ohio, USA
- Richmond, Indiana, USA
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| Parent Company | - Harsco Corporation
- Indian Head, Inc.
- Richmond Transportation Corporation
- Thyssen-Bornemisza Group N.V.
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| abstract | - In the late 1960s, a weak point and location of structural failure in catastrophic school bus crashes was considered to be body joints, the points where panels and pieces were fastened together. Longitudinal steel guard rails had been in use since the 1930s to protect the sides of buses, but behind them on the sides and on the roofs, manufacturers used many individual panels to construct a bus body. Around 1967, safety engineers at Ward Body Works of Conway, Arkansas subjected one of their school bus bodies to a multiple roll test, and noted the separation at the joints. Ward engineers noted that many of their competitors were using far fewer rivets. This resulted in new attention by all body manufacturers to the number and quality of fasteners. To Wayne engineers, simply increasing the number of fasteners (rivets, screws, and huckbolts) was not satisfactory. In their own tests, the joints were always the weak point under high stress loads regardless of the number of fasteners. They also noted how the continuous guard rails used on the sides tended to spread the stress away from the point of impact, allowing it to be shared and dissipated at portions of the body structure further away. Instead of trying to figure out how to make the fasteners do a better job, the engineers stood back and wondered how the design features of the guard rails could be expanded. The result was a revolutionary new design in school bus construction: continuous longitudinal interior and exterior panels for the sides and roofs.
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