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Investigation into the Effect of Interlock Volume on SPR Strength

During the design of automotive structures assembled using Self-Piercing Rivets (SPRs), a rivet and die combination is selected for each joint stack. To conduct extensive physical tensile testing on every joint combination to determine the range of strength achieved by each rivet–die combination, a...

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Autores principales: Jepps, Lewis, Briskham, Paul, Sims, Neil, Susmel, Luca
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095772/
https://www.ncbi.nlm.nih.gov/pubmed/37049040
http://dx.doi.org/10.3390/ma16072747
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author Jepps, Lewis
Briskham, Paul
Sims, Neil
Susmel, Luca
author_facet Jepps, Lewis
Briskham, Paul
Sims, Neil
Susmel, Luca
author_sort Jepps, Lewis
collection PubMed
description During the design of automotive structures assembled using Self-Piercing Rivets (SPRs), a rivet and die combination is selected for each joint stack. To conduct extensive physical tensile testing on every joint combination to determine the range of strength achieved by each rivet–die combination, a great deal of lab technician time and substrate material are required. It is much simpler and less material-consuming to select the rivet and die solution by examining the cross sections of joints. However, the current methods of measuring cross sections by measuring the amount of mechanical interlock in a linear X–Y direction, achieved with the flared rivet tail, do not give an accurate prediction of joint strength, because they do not measure the full amount of material that must be defeated to pull the rivet tail out of the bottom sheet. The X–Y linear interlock measurement approach also makes it difficult to rapidly rank joint solutions, as it creates two values for each cross section rather than a single value. This study investigates an innovative new measurement method developed by the authors called Volumelock. The approach measures the volume of material that must be defeated to pull out the rivet. Creating a single measurement value for each rivet–die combination makes it much easier to compare different rivet and die solutions; to identify solutions that work well across a number of different stacks; to aid the grouping of stacks on one setter for low-volume line; and to select the strongest solutions for a high-volume line where only one or two different stacks are made by each setter. The joint stack results in this paper indicate that there is a good predictive relationship between the new Volumelock method and peel strength, measured by physical cross-tension testing. In this study, the Volumelock approach predicted the peel strength within a 5% error margin.
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spelling pubmed-100957722023-04-13 Investigation into the Effect of Interlock Volume on SPR Strength Jepps, Lewis Briskham, Paul Sims, Neil Susmel, Luca Materials (Basel) Article During the design of automotive structures assembled using Self-Piercing Rivets (SPRs), a rivet and die combination is selected for each joint stack. To conduct extensive physical tensile testing on every joint combination to determine the range of strength achieved by each rivet–die combination, a great deal of lab technician time and substrate material are required. It is much simpler and less material-consuming to select the rivet and die solution by examining the cross sections of joints. However, the current methods of measuring cross sections by measuring the amount of mechanical interlock in a linear X–Y direction, achieved with the flared rivet tail, do not give an accurate prediction of joint strength, because they do not measure the full amount of material that must be defeated to pull the rivet tail out of the bottom sheet. The X–Y linear interlock measurement approach also makes it difficult to rapidly rank joint solutions, as it creates two values for each cross section rather than a single value. This study investigates an innovative new measurement method developed by the authors called Volumelock. The approach measures the volume of material that must be defeated to pull out the rivet. Creating a single measurement value for each rivet–die combination makes it much easier to compare different rivet and die solutions; to identify solutions that work well across a number of different stacks; to aid the grouping of stacks on one setter for low-volume line; and to select the strongest solutions for a high-volume line where only one or two different stacks are made by each setter. The joint stack results in this paper indicate that there is a good predictive relationship between the new Volumelock method and peel strength, measured by physical cross-tension testing. In this study, the Volumelock approach predicted the peel strength within a 5% error margin. MDPI 2023-03-29 /pmc/articles/PMC10095772/ /pubmed/37049040 http://dx.doi.org/10.3390/ma16072747 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jepps, Lewis
Briskham, Paul
Sims, Neil
Susmel, Luca
Investigation into the Effect of Interlock Volume on SPR Strength
title Investigation into the Effect of Interlock Volume on SPR Strength
title_full Investigation into the Effect of Interlock Volume on SPR Strength
title_fullStr Investigation into the Effect of Interlock Volume on SPR Strength
title_full_unstemmed Investigation into the Effect of Interlock Volume on SPR Strength
title_short Investigation into the Effect of Interlock Volume on SPR Strength
title_sort investigation into the effect of interlock volume on spr strength
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095772/
https://www.ncbi.nlm.nih.gov/pubmed/37049040
http://dx.doi.org/10.3390/ma16072747
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