Abstract
Abstract Preload is the primary reason why pre-tightened tooth connections (PTTC) can transfer relatively large loads. However, creep of the composite would cause the preload relaxation, resulting in reducing bearing capacity of the connection. To study the preload relaxation of PTTC caused by the creep of composites, a prediction formula is deduced by converting the viscoelastic problem to an elastic problem using Laplace transform. Meanwhile, long-term experimental research on the preload relaxation of composite pre-tightened tooth connection with different initial preloads and different geometry sizes was made. The theoretical results are compared with experimental data obtained by long-term experiment, and the results indicate that the calculation formula can predict the preload relaxation well in linear viscoelastic state. The preload relaxation mainly occurs at the beginning of loading and it tends to be steady in the middle and later periods.
Highlights
Composite pre-tightened teeth connection is a novel composite connection technology [1]. this connections technology are stripe-shaped teeth manufactured at the connection end of a composite with well-matched teeth on the metal connected to the composite
To study the preload relaxation of pre-tightened tooth connections (PTTC) caused by the creep of composites, a prediction formula is deduced by converting the viscoelastic problem to an elastic problem using Laplace transform
The theoretical results are compared with experimental data obtained by long-term experiment, and the results indicate that the calculation formula can predict the preload relaxation well in linear viscoelastic state
Summary
Composite pre-tightened teeth connection is a novel composite connection technology [1]. this connections technology are stripe-shaped teeth manufactured at the connection end of a composite with well-matched teeth on the metal connected to the composite. Preload is the major reason why composite PTTC can transfer relatively large loads It does enhance shear strength between composite materials, and enables the connection to offer larger friction during force transfer [6]. Because of creep of the composite, the preload q exerted on the composite changes over time This change will affect the bearing capacity of composite joint [9]. The main objective of this work is to research preload relaxation of PTTC by the theory and experiment at room temperature, when the external loads are not exerted on the joint. When the bearing capacity of joint is calculated, the preload relaxation should be considered This theoretical derivation can be applied in the preload relaxation of composite PTTC, and can be used in the preload relaxation of composite bolt connection
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