Contact stresses in conical rollers

This article presents a new and detailed study on the characterization of material properties of AA 6063 T6 and T7 tempers and their effects on crushing response and energy absorption in a novel tubular structural member for design for crashworthiness purposes. These properties were characterized into three regions: the elastic, the uniform plastic, and the ductile damage regions. Standard tensile tests were used to ascertain the elastic and plastic properties up until uniaxial instability. To characterize the ductile damage, a phenomenological model was employed using a decaying exponential fit of triaxial stresses versus equivalent plastic strain data obtained from finite element and experimental models of flat notched specimens. A new theoretical model for predicting the crushing behavior of the novel cross tube was developed. A numerical, experimental, and theoretical comparison of the mean crushing force for novel extruded crossshaped specimens of both tempers was also presented. The results of this study provide valuable insights into the applications of T6 and T7 tempers of aluminum as energy-absorbing materials for novel cross-shaped structural members for improved crashworthiness.

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“…The results of this theoretical model will be verified through numerical approach 17 as well as experimental approach.…”

Section: Methodsmentioning

confidence: 84%

“…Here The sum yielded the new mean crushing force estimate of the tube experiencing type 1 or 3 folding The results of this theoretical model will be verified through numerical approach 17 as well as experimental approach.…”

Section: Mode Imentioning

confidence: 80%

Development of aluminum alloy 6063 T6 and T7 material models and their effects on energy-absorbing characteristics of cross-axial members

Ohioma

Ali

Kraft

et al. 2018

The Journal of Strain Analysis for Engineering Design

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“…Figures 8 and 9 show wear on the polymer bearings shaft. The higher wear on the edges of the shaft-bearing contact surface is probably due to entrapment of sediments in gaps among the snap rings, bearings, and shaft and increased edge contact pressure effects which are commonly observed in surface contact conditions [25]. This result suggests that for sedimented water, in addition to high wear resistant polymer bearings, a surface hardened or coated shaft may provide better performance.…”

Section: Testing Apparatusmentioning

confidence: 95%

Impact of sediments on wear performance of critical sliding components of hydrokinetic devices

et al. 2015

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The work discussed here is a continuation of the study presented in [1], in which a customized test apparatus was presented that was capable of conducting tribological related experiments on sliding components commonly used in hydrokinetic devices such as bearings, drive shaft and seals. The wear on critical sliding components introduces unnecessary clearances which can significantly reduce the performance and reliability of hydrokinetic devices. In the previous study [1], four types of bearings, namely Vesconite, CIP, Feroform T814, and Poly Crystalline Diamond (PCD) coated bearings were tested for 60 hours in clean water. The data showed that PCD bearings outperformed polymer based bearings in terms of wear and frictional resistance. In the present study, the same set of bearings were tested for 60 hours in fresh sedimented water. The experimental data revealed that PCD bearings had higher wear resistance as compared to its polymer based counterparts. In addition to wear on bearing surface, a significant amount of wear on the drive shaft was observed. These results reveal that (in addition to high wear resistant polymer bearings) a surface hardened shaft may increase the longevity of bearing-shaft assembly in sedimented water.

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“…They showed that the accuracy of graded finite elements are much greater than the conventional finite elements. Investigation on rolling contact stresses in conical rollers using FEM is considered by Ali et al 36 where they employed a parametric study by diversifying vertex angles, material types, and loading conditions. The crack propagation problem for a FG coating–substrate system is studied by Yildirim et al 37 by assuming a semi-elliptical surface crack on the geometry.…”

Section: Introductionmentioning

confidence: 99%

The effect of orthotropic material gradation on the plane sliding frictional contact mechanics problem

Yilmaz

Çömez

Güler

et al. 2019

The Journal of Strain Analysis for Engineering Design

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With the advent of new functional and intelligent non-conventional materials, understanding the behavior of these materials in different contact conditions over the conventional materials is one of the most crucial aspects in early design process for coated systems. Therefore, the sliding contact problem for a functionally graded orthotropic coating–substrate system and a rigid cylindrical punch is considered in this article to study the aforementioned aspects. The functionally graded orthotropic coating is modeled to be bonded to an isotropic substrate of finite thickness and is loaded by a sliding rigid cylindrical punch under plane strain conditions. For the material orthotropy, five different real orthotropic materials are utilized and the stiffness coefficients of each principal direction are graded separately. Navier’s equations are converted to ordinary differential equations using the Fourier integral transformation technique. Then, the algebraic equations are solved and the problem is cast into a singular integral equation. A parametric finite element analysis based on augmented contact method is also conducted. The normalized surface stress distributions and the normalized contact boundaries obtained from finite element analysis are validated with the results obtained from singular integral equation approach. The results of this study may be helpful for engineers in design and optimization of the characteristics of non-conventional coatings that are used as thermal or structural barriers and wear-resistant surfaces in engineering applications.

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Contact stresses in conical rollers

Cited by 9 publications

References 10 publications

Development of aluminum alloy 6063 T6 and T7 material models and their effects on energy-absorbing characteristics of cross-axial members

Development of aluminum alloy 6063 T6 and T7 material models and their effects on energy-absorbing characteristics of cross-axial members

Impact of sediments on wear performance of critical sliding components of hydrokinetic devices

The effect of orthotropic material gradation on the plane sliding frictional contact mechanics problem

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