Heat Straightening Damaged Steel Plate Elements

Avent, R. Richard; Mukai, David; Robinson, P.; Boudreaux, Randy J.

doi:10.1061/(asce)0733-9445(2000)126:7(747)

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…Significant research has been conducted on the heat straightening repair of steel girder bridges. Researchers have conducted experimental investigations to determine the deformations and residual stresses produced by heat straightening (4)(5)(6)8). The results from these studies were used to develop empirical equations and guidelines for conducting heat straightening in the field (2).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Kowalkowski¹,

Varma

2007

Transportation Research Record

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Experimental investigations were conducted to evaluate the effects of multiple cycles of damage followed by heat straightening repair on the structural properties and fracture toughness of steel bridge beams. Six W24×76 (or equivalent) beam specimens made from A7, A588, or A36 steel (two beam specimens of each steel type) were subjected to three cycles of damage followed by heat straightening repair. In each cycle, the beam specimens were damaged statically in weak axis bending and were repaired with several half-depth vee heats and an external restraining force. Material specimens were machined from the flanges of the damaged-repaired beam specimens and tested according to ASTM standards. The material test results indicated that multiple damage-repair cycles did not have a significant influence on the elastic modulus, ultimate stress, and surface hardness of the steels. Multiple damage-repair cycles generally increase the yield stress and reduce the ductility of the steels. The Charpy V-notch fracture toughness of A7 and A36 steel beams repaired with maximum heating temperature (Tmax) equal to 650°C was lower than the fracture toughness of the corresponding undamaged steels. The CVN fracture toughness of A588 steel beams repaired with Tmax equal to 650°C and the A36 steel beam repaired with Tmax equal to 760°C was higher than the fracture toughness of the corresponding undamaged steels. Material specimens that were removed from locations closer to the flange-web interface consistently had lower fracture toughness and ductility.

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Section: Introductionmentioning

confidence: 99%

“…Significant research has been conducted on the heat-straightening repair of damaged steel shapes (4)(5)(6) and the effects of damage and repair on steel beams (6)(7)(8). On the basis of this research, heatstraightening repair guidelines have been developed by Shanafelt and Horn (9) and Avent and Mukai (2).…”

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confidence: 99%

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Kowalkowski¹,

Varma

2007

Transportation Research Record

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“…were derived from Clausen research [18]. Avent et al [14] also employed fairly similar properties. The structural properties of the steel are shown in Figure 4.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…According to their results, the repetition of line heating in one area led to an increase in bending. But it is worth noting that Connor et al [13] and Avent et al [6,14] investigated the changes in fatigue and fracture characteristics of materials during the elimination of bridges distortion by the line heating method. Their results showed a significant reduction in the yield stress and toughness of the steel by heating the same zone more than three times.…”

Section: Introductionmentioning

confidence: 99%

Increasing bending angle in thick-walled pipes with wide heating

Chavoshi

Torshizi

2019

Mechanics & Industry

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The spot heating of a metal part leads to many small deformations. The applications of this method are straightening the bridge parts, turbo-machinery shafts, and so forth. The movement of the heat source on a given path (line heating) leads to an increase in the deformation and the possibility of creating complex bends. However, it is complicated to predict and control the path and velocity of the heat source as well as determining the heat intensity. In the pipes, this method requires simultaneous control over the two torches on both sides of the pipe. The present study aims at investigating the mechanism of deformation and increasing the bending angle in thick pipes by means of a simple heating method. At first, the maximum bending in heating a large circular zone (entitled “wide heating”) is obtained by simulating the process using finite element method and optimizing it applying the genetic aggregation algorithm. Then, a new method for simultaneous heating within two zones is introduced. The interaction between two zones leads to the development of the shortening mechanism in the pipe wall and a significant increase in the bending angle. In this method, there is no need to move the torch where the temperature is controlled more accurately. To evaluate the finite element model, several pipe heating tests are performed with their results being agreed well with the simulation results.

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“…For instance, in a welding process, a metallic flat plate expands when it is under a local concentration of heat, but the surrounding unheated metal causes plane stresses and finally develops the buckling effect on the plate [3,4]. Moreover, this buckling effect introduces a new load that does not let stability on the plate.…”

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confidence: 99%

Modeling of a Heat-Induced Buckling of Plates Using the Mesh-free Method

Mejia¹

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In the process of engineering design of structural shapes, the flat plate analysis results can be generalized to predict behaviors of complete structural shapes. In this case, the purpose of this project is to analyze a thin flat plate under conductive heat transfer and to simulate the temperature distribution, thermal stresses, total displacements, and buckling deformations. The current approach in these cases has been using the Finite Element Method (FEM), whose basis is the construction of a conforming mesh. In contrast, this project uses the mesh-free Scan Solve Method. This method eliminates the meshing limitation using a non-conforming mesh. I implemented this modeling process developing numerical algorithms and software tools to model thermally induced buckling. In addition, convergence analysis was achieved, and the results were compared with FEM. In conclusion, the results demonstrate that the method gives similar solutions to FEM in quality, but it is computationally less time consuming.

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Heat Straightening Damaged Steel Plate Elements

Cited by 13 publications

References 2 publications

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Increasing bending angle in thick-walled pipes with wide heating

Modeling of a Heat-Induced Buckling of Plates Using the Mesh-free Method

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