| 摘要 |
<p>A tensile test (13) grip for holding a specimen (14) has a pullrod (25) that is mounted in an annular bore (37), and carries a piston head (26) that fits within a piston chamber (31), and both the pullrod (25) and piston head (26) are sealed on their outer surfaces with respect to the housing (32) forming the piston chamber (31), to form an enclosed chamber (11) in which hydraulic fluid can be provided to permit swiveling alignement of the pullrod (25) and the piston head (21) relative to the housing (32) that is a function of the direction of loading between the pullrod (25) and the housing (32). The seal on the pullrod and the seal on the piston head with respect to the respective surfaces on which they seal is on a very short part spherical land (43) to permit the pullrod (25) and piston head (26) to shift with respect to the housing (32) and provide self alignment. The pullrod (25) and piston (26) can swivel freely for a limited amount to provide alignment during tensile loads.</p> |
