Dynamic Denting of Autobody Panels

Burley, C. E.; Niemeier, B. A.; Koch, Gerd

doi:10.4271/760165

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…Dynamic testing, however, simulates the real conditions much better. e energy to produce a 0.1 mm dent in car door panels and stretched dome panels increased with increasing load rate [19].…”

Section: Dent Resistance Of Steel Sheetsmentioning

confidence: 92%

“…is test was carried out from a quasi-static to dynamic loading of up to 26.8 m/min. rough dynamic testing using a pneumatic gun and steel indenter, Burley et al [19] found that dynamic denting was related to panel thickness, yield stress, modulus of elasticity, density, and panel shape. A decrease in panel stiffness of bake hardened steel was found to result in an increase in dynamic dent resistance [20].…”

Section: Dent Resistance Of Steel Sheetsmentioning

confidence: 99%

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[Retracted] Examining Dent Formation Caused by Hailstone Impact

2019

Shock and Vibration

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Hailstorms pose significant risk for exposed building cladding materials. Steel sheeting is the most important cladding material used. The understanding of steel sheets behavior under hail impact loading is not sufficient for the manufacturing of hail-resistant sheets. With the purpose-built equipment, artificial hailstones of different sizes were launched to impact at steel sheets of different thicknesses and yield stresses as targets. A theoretical approach for the problem of predicting the dent size due to hailstone impact was developed and compared to the test results. The expressions developed in the theory can predict the dent depth before the impact, assuming the ratio between the dent depth and dent diameter is constant. The expression is not able to predict the depth of dents smaller than 0.75 mm and cannot predict whether the denting will occur or not. All hailstone sizes lead to visible dent on steel sheet of thicknesses 0.35 mm, 0.42 mm, and 0.55 mm. Visible denting was also obtained for the 0.75 mm steel samples with 45 mm and 55 mm hailstones; however, no denting occurred using 40 mm hailstones. It was found that the dent depth was inversely proportional with thickness and yield stress, while the dent diameter was found to be proportional to yield stress. As the yield stress of the steel sheet increased, the dent depth decreased for G300 and G550 steel. The dent diameter however increased as the yield stress increased. When the artificial hailstone shatters on impact, significant energy is lost and less energy is available to cause plastic deformation of the impacted material.

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Section: Dent Resistance Of Steel Sheetsmentioning

confidence: 92%

Section: Dent Resistance Of Steel Sheetsmentioning

confidence: 99%

[Retracted] Examining Dent Formation Caused by Hailstone Impact

2019

Shock and Vibration

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“…Burley et al [33] confirmed that dynamic dent resistance is affected by factors such as panel density, modulus of elasticity, and curvature. Thomas D. presented the test of the AA6111 steel sheet.…”

Section: Yield Strength and A Dent Resistance-findings From The Litermentioning

confidence: 97%

“…The analysis shows that the model for DP 500 HCT 590X steel is more precise. Nevertheless, it can be concluded that the increased yield strength by the BH effect is predictable and can be described by the second-order multi-polynomial regression model with ten coefficients C 1 to C 33 . The values of coefficients in Table 5 are valid for given sample geometry and thickness.…”

Section: Multi-polynomial Regression Modelmentioning

confidence: 98%

Prediction of Bake Hardening Behavior of Selected Advanced High Strength Automotive Steels and Hailstone Failure Discussion

Mihaliková

Zgodavová

Bober

et al. 2019

Metals

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The purpose of the present study is three-fold. Firstly, it attempts to describe the bake hardening (BH) behavior of selected interstitial free (IF) and dual phase (DP) steels. Secondly, it predicts the BH behavior of the IF DX 51D and DP 500 HCT 590X plates of steel, and thirdly studies material failure prevention in scholarly sources. The research is aimed at investigating the increasing steel strength during the BH of these two high-strength sheets of steel used for outer vehicle body parts. Samples of steel were pre-strained to 1%, 2%, and 5% and then baked at 140–220 °C for 10 to 30 min. The BH effect was determined from three factors: pre-strain, baking temperature, and baking time. Research has shown that increasing the yield strength by the BH effect is predictable. Therefore, the number of experiments could be reduced for the investigation of BH effect for other kinds of IF and DP steels. The literature study of the hailstone failure reveals that the knowledge of BH steels behavior helps to calculate the steel supplier´s failure mode effect analysis (FMEA) risk priority number.

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A parameter study for static and dynamic denting

Jung

Worswick

2004

KSME International Journal

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Dynamic Denting of Autobody Panels

Cited by 15 publications

References 5 publications

[Retracted] Examining Dent Formation Caused by Hailstone Impact

[Retracted] Examining Dent Formation Caused by Hailstone Impact

Prediction of Bake Hardening Behavior of Selected Advanced High Strength Automotive Steels and Hailstone Failure Discussion

A parameter study for static and dynamic denting

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