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|  MIL-T-46705E
* 3.6 Construction and stresses. Main frame members shall be fabricated of high strength
steel with a yield strength of not less than 345 mega Pascals (mPa) (50,000 pounds per square
inch). Main frame members shall be adequately braced with a sufficient number of
crossmembers to present a rigid construction with sufficient strength for the dynamic and static
loads imposed. All parts of the framing shall be completely electric-arc welded. The strength of
the finished welds shall be such that they will not fail or crack when the trailer is subjected to the
loads and performance requirements specified herein. When the trailer is loaded as specified in
3.4, the maximum fiber stress in each frame member shall be not greater than 50 percent of the
frame material yield strength.
* 3.6.1 Frame splices. Main frame members shall have one piece upper and lower flanges,
running the full length of the trailer. Where frame members are otherwise spliced, joints shall be
reinforced to fulfill the dynamic and the static loading requirements specified herein. Splices
shall be designed to avoid stress concentration. Splice welds shall be continuous.
* 3.6.2 Stress analysis. A stress analysis for the trailer, loaded as specified in 3.4, shall be
performed. The stress analysis shall include shear and moment diagrams and deflection
calculations. Stress calculations shall include complete analysis of the floor, crossmembers, and
longitudinal frame members.
3.6.3 Chassis. The vehicle shall be a 4-wheel, stake and platform, full trailer. The trailer
shall be furnished with all accessories, components, parts, and assemblies to provide a complete
vehicle.
3.7 Axles. Axles shall have a rated capacity at least equal to the load imposed on each axle,
measured at the ground, when the trailer is loaded as specified in 3.4. The front axle shall be
trunnion mounted to minimize distortion to trailer components when traversing uneven terrain,
and shall be incorporated in a fifth wheel of sufficient dimensions to assure trailer stability
throughout a 360 degree turning circle. The fifth wheel plate shall incorporate grease fittings and
grooves to facilitate lubrication.
3.8 Suspension (type II). Type II trailer shall be furnished with a suspension system with
components having a rated capacity at least equal to the load imposed on each member,
measured at the ground, with the trailer loaded as specified in 3.4. When suspension capacity is
rated at the spring pads, unsprung weight shall be deducted.
3.8.1 Springs. Type II trailer shall be furnished with individual wheel, semielliptical springs
and shall support the loads imposed under the performance conditions specified.
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