Numerical prediction of thermal panel distortion in automotive paint shop

Albiez, Christoph; Liewald, Mathias

doi:10.1179/1749514812z.00000000015

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…Furthermore, strain hardening effects as a result of cold deformation processes in the press shop lead to a higher initial yield strength level. The change of yield strength during age hardening processes at higher temperatures for AA6016 was further investigated by Albiez [4] and An [7] on the basis of tensile tests and reconfirmed by own measurements. It can be shown that the yield strength increases with time according to age hardening and the most critical state is represented when the maximum object temperatures of ϑ=200 °C are immediately reached.…”

Section: Deformation Mechanisms Of Aluminiummentioning

confidence: 88%

“…The loads were varied at three times (t=5, 10 and 30 min) and three metal strips were tested for each stress-time combination. Since the highest applied bending stress must not exceed the yield strength σ y,200 at ϑ=200 °C, the maximum stress σ max within the metal strip has to match equation (4), where b stands for the width and s 0 for the thickness. Three loads F were chosen so that the maximum stresses will account for σ max =22, 49 and 63 N/mm² in the outer fibre of the strips, which is sufficiently less than the measured yield strength of σ y,200 =117 N/mm².…”

Section: Investigation Of the Creep Behaviour Of Aa6016mentioning

confidence: 99%

“…Further, an increase of yield strength has to be achieved in order to improve the crash properties, which can be reached by an artificial hardening process during paint drying [3]. In the ecoat dryer, the car body structure receives temperatures up to ϑ=200 °C for a time t=20 min plus heating and cooling time, which represents the worst case scenario of all paint dryers [4].…”

Section: Introductionmentioning

confidence: 99%

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Creep Behaviour of AA6016 during Automotive Paint Drying Processes

Regensburger

Lima

Albiez

et al. 2015

KEM

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Modern car-bodies consist of different types of metals in order to gain the best crash performance at minimal weight. After the press and body shop, the bodies in white run through several paint drying processes, where also alloys of the 6xxx series become heat-treated. Consequently, the different thermal expansion behaviour of joined aluminium-steel components leads to high bending stress conditions within the car body structure while they heat up to 200 °C. In order to describe the process deformations numerical simulations were developed, where appropriate material models are necessary. Especially aluminium alloys with a melting point of about 600 °C can exhibit viscoplastic behaviour at 200 °C under stress. In this work, creep characteristics of the aluminium alloy AA6016 are investigated using a bending test. Based on these results an adequate model for finite element (FE-) simulations of creep strains is pointed out, which can be used for novel analyses of the whole car body in the automotive e-coat drying process.

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Section: Deformation Mechanisms Of Aluminiummentioning

confidence: 88%

Section: Investigation Of the Creep Behaviour Of Aa6016mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Creep Behaviour of AA6016 during Automotive Paint Drying Processes

Regensburger

Lima

Albiez

et al. 2015

KEM

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“…Differential thermal expansion must be accounted for during the design and development of mixed material structures, such as automobiles and aircrafts, which are exposed to temperature fluctuations. [1][2][3][4] Given the mixed material construction of passenger vehicles it is of interest to develop materials that possess local and tailorable CLTE in as a method to overcome this differential thermal expansion.…”

Section: Introductionmentioning

confidence: 99%

Tailoring thermal expansion of mechanically interlocked carbon fiber composite reinforced metal

Newcomb

2022

Polymer Composites

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A method of controlling the thermal expansion of lightweight metals through the insightful incorporation of unidirectional carbon fiber reinforced polymer (CFRP) is demonstrated. The local and directional coefficients of linear thermal expansion (CLTE) of a carbon fiber composite reinforced aluminum (CFRP/Al) specimen can be controlled by tailoring the CFRP volume fraction and CFRP layup orientation, with a 36% reduction in CLTE achieved as compared to the baseline 7075 aluminum at a CFRP volume fraction of 0.26. When a unidirectional CFRP reinforcement is considered, the CLTE as predicted by the modulus modified rule of mixtures is within 1.3% of experimentally obtained values for CFRP volume fractions of 0.10, 0.16, and 0.26. Thermal digital image correlation (T-DIC) was performed to obtain local and directional CLTE values for the anisotropic CFRP/Al specimens which indicated CLTE is heterogeneous across the specimen length and width, which is otherwise undetected using standard quartz rod dilatometry to measure the CLTE of the macroscopic sample. Evidence for a minimum critical CFRP reinforcement length is also considered based upon the local thermal strain data collected by T-DIC. Using the mixed material approach presented here, it is possible to minimize or eliminate the thermal expansion mismatch effects that occur in mixed material structures, such as an automotive body structure (i.e., body in white).

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Numerical prediction of thermal panel distortion in automotive paint shop

Cited by 2 publications

References 11 publications

Creep Behaviour of AA6016 during Automotive Paint Drying Processes

Creep Behaviour of AA6016 during Automotive Paint Drying Processes

Tailoring thermal expansion of mechanically interlocked carbon fiber composite reinforced metal

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