According to the characteristics of a multispot pressure tensioning process, representative process parameters are summarized in this article.
Tensioning effect analysis of circular saw blade based on finite element method
The Dynamic/Explicit module of ABAQUS software was chosen to simulate the elastic-plastic loading process of multispot pressure tensioning. One simulation for verification of the finite element model is shown in Figure 2, where F was set to 40 kN, M was set to 3, A' was set to 16, [R.sub.w] was set to 140 mm, and d was set to 30 mm.
The tensioning stress field of the circular saw blade was calculated by the Static/General module of ABAQUS software using the stress field of loading process calculated by the Dynamic/Explicit module as initial conditions.
Natural frequencies of the circular saw blade were calculated by the Frequency module of ABAQUS software using the tensioning stress field calculated by the Static/General module as initial conditions.
The tensioning stress field is the most important link for the model, which can also determine the precision of the natural frequency.
The tensioning stress test path and numerical extraction path for tensioning stress calculation results were the same, as shown by the center line in Figure 2.
In making its own decision, Pacific Press, publisher of the 188,000-circulation Vancouver Sun and 161,000-circulation tabloid Province in British Columbia, leaned towards tensioning systems that do not use belts and do have a dedicated infeed control, says Jack Ferguson, director of production for the Southam chain.
"We spent a lot of money developing tensioning systems," says Doug Lang, MAN Roland's inside sales manager.
For a method that is essentially strengthening concrete with steel, post tensioning patently requires a high level of knowledge to properly install, maintain and modify.
"As our core business is post tensioning, we have been able to redesign bridges to make them more efficient to build - the key is the understanding of how the technology works and how it can have an overall benefit on a project."