Novel setup for the investigation of tribological behavior of sheet metal surfaces

Merklein, Marion; Engel, Ulf; Vierzigmann, Ulrich

doi:10.1007/s12289-009-0472-2

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…To be able to correlate A real with measurement signal calibration measurements were done. Additional information to the setup and its calibration can be found in [10]. For the tests zinc coated DC04 sheet metal with an electro discharge texture (EDT) was used.…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of friction in metal forming using a halfspace model

Hauer¹,

Vierzigmann²,

Willner³

et al. 2011

AIP Conference Proceedings

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Influence of carbon content and nitrogen vacancies on the bonding structure and mechanical performance of graphite-like BCxN thin films J. Appl. Phys. 112, 063525 (2012) Thermally switchable adhesions of polystyrene-block-poly(n-isopropylacrylamide) copolymer pillar array mimicking climb attitude of geckos Appl. Phys. Lett. 101, 123701 (2012) Evolution of coefficient of friction with deposition temperature in diamond like carbon thin films J. Appl. Phys. 112, 023525 (2012) Facile characterization of ripple domains on exfoliated graphene Rev. Sci. Instrum. 83, 073905 (2012) Additional information on AIP Conf. Proc. Abstract. Sheet and bulk metal forming are widely used manufacturing methods. The industrial trend towards function integration leads to a demand for workpieces having features of both methods. The new forming technology sheet-bulk metal forming is a promising approach to manufacture workpieces with functional elements. Tribological aspects generally play an important role in metal forming processes. Especially for the formability of functional elements friction is very important. The coexistence of low and high contact pressures is characteristic of sheet-bulk metal forming and presents a challenge for the friction modelling. The surfaces of tool and workpiece are always rough, so that initial contact only occurs at the asperities of surface roughness. Consequently for small and moderate loads the real contact area is smaller than the apparent contact area. Surface traction can only occur in the real contact area, so that it is necessary to determine the real contact area in order to study the tribological behaviour of contact pairs. In order to get an accurate determination of the real contact area it is necessary to calculate the surface deformation in a three-dimensional model and to validate the simulation model by measurements. The halfspace approach has the significant advantage that only the surface has to be discretised, while in a Finite Element Analysis the whole bulk has to be discretised. Consequently the numerical effort, and thus the calculation time, in the halfspace model are much lower than in FE-modelling. The numerical solution scheme based on the halfspace theory is presented in this paper. Results of the calculation of the real contact area of rough surfaces are compared to experimental data from ultrasonic inspection. Friction coefficients calculated with the halfspace model are compared to results of strip drawing tests.

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Section: Methodsmentioning

confidence: 99%

Numerical simulation of friction in metal forming using a halfspace model

Hauer¹,

Vierzigmann²,

Willner³

et al. 2011

AIP Conference Proceedings

Self Cite

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“…More complicated is the case of the ultrasound transmission through sliding contacts [21,25,[41][42][43][44][45][46], with the pioneering work of Kendall and Tabor [25] being one of the most significant. They used a pin on disc rig under steady sliding and a longitudinal ultrasonic transducer.…”

Section: Ultrasounds and Contactmentioning

confidence: 99%

On the Use of Ultrasound Waves to Monitor the Local Dynamics of Friction Joints

et al. 2019

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Friction joints are one of the fundamental means used for the assembly of structural components in engineering applications. The structural dynamics of these components becomes nonlinear, due to the nonlinear nature of the forces arising at the contact interface characterised by stick-slip phenomena and separation. Advanced numerical models have been proposed in the last decades which have shown some promising capabilities in capturing these local nonlinearities. However, despite the research efforts in producing more advanced models over the years, a lack of validation experiments made it difficult to have fully validated models. For this reason, experimental techniques which can provide insights into the local dynamics of joints can be of great interest for the refinement of such models and for the optimisation of the joint design and local wear predictions. In this paper, a preliminary study is presented where ultrasound waves are used to characterise the local dynamics of friction contacts by observing changes of the ultrasound reflection/transmission at the friction interface. The experimental technique is applied to a dynamic friction rig, where two steel specimens are rubbed against each other under a harmonic tangential excitation. Initial results show that, with a controlled experimental test procedure, this technique can identify microslip effects at the contact interface.

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Novel setup for the investigation of tribological behavior of sheet metal surfaces

Cited by 2 publications

References 13 publications

Numerical simulation of friction in metal forming using a halfspace model

Numerical simulation of friction in metal forming using a halfspace model

On the Use of Ultrasound Waves to Monitor the Local Dynamics of Friction Joints

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