{"id":1028,"date":"2023-05-15T10:45:45","date_gmt":"2023-05-15T08:45:45","guid":{"rendered":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/?p=1028"},"modified":"2023-09-22T13:42:52","modified_gmt":"2023-09-22T11:42:52","slug":"grain-size-distribution-does-not-affect-the-residual-shear-strength-of-granular-materials-an-experimental-proof","status":"publish","type":"post","link":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/2023\/05\/15\/grain-size-distribution-does-not-affect-the-residual-shear-strength-of-granular-materials-an-experimental-proof\/","title":{"rendered":"Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof"},"content":{"rendered":"\n

O. <\/strong>Polania, M. Cabrera, M. Renouf, E. Az\u00e9ma and Nicolas Estrada, Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof, Phys. Rev. E-Letter<\/em><\/strong>, 107, L052901 (2023)<\/p>\n\n\n\n

Granular materials are used in several fields and in a wide variety of processes. An important feature of these materials is the diversity of grain sizes, commonly referred to as polydispersity. When granular materials are sheared, they exhibit a predominant small elastic range. Then, the material yields, with or without a peak shear strength depending on the initial density. Finally, the material reaches a stationary state, in which it deforms at a constant shear stress, which can be linked to the residual friction angle \u03c6r. However, the role of polydispersity on the shear strength of granular materials is still a matter of debate. In particular, a series of investigations have proved, using numerical simulations, that \u03c6r is independent of polydispersity. This counterintuitive observation remains elusive to experimentalists, and especially for some technical communities that use \u03c6r as a design parameter (e.g., the soil mechanics community). In this Letter, we studied experimentally the effects of polydispersity on \u03c6r . In order to do so, we built samples of ceramic beads and then sheared these samples in a triaxial apparatus. We varied polydispersity, building monodisperse, bidisperse, and polydisperse granular samples; this allowed us to study the effects of grain size, size span, and grain size distribution on \u03c6r. We find that \u03c6r is indeed independent of polydispersity, confirming the previous findings achieved through numerical simulations. Our work fairly closes the gap of knowledge between experiments and simulations.<\/p>\n\n\n\n

\"\"
Close-up scale views of some of the tested granular systems. (a)\u2013(c) Grains with diameters d <\/em>= 0.15 \u00b1 0.05 mm, d <\/em>= 1.1 \u00b1 0.1 mm, and d <\/em>= 1.9 \u00b1 0.1 mm, respectively, (d) bidisperse sample with \u03bb = 2.1, and (e) and (f) polydisperse samples with \u03bb = 3.1 and 10, respectively. A 10 mm scale is shown in the upper- left-hand corner.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

O. Polania, M. Cabrera, M. Renouf, E. Az\u00e9ma and Nicolas Estrada, Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof, Phys. Rev. E-Letter, 107, L052901 (2023) Granular materials are used in several fields and in a wide variety of processes. An important feature of these materials is the diversity of grain […]<\/p>\n","protected":false},"author":15,"featured_media":1030,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"_links":{"self":[{"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/posts\/1028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/comments?post=1028"}],"version-history":[{"count":3,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/posts\/1028\/revisions"}],"predecessor-version":[{"id":1114,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/posts\/1028\/revisions\/1114"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/media\/1030"}],"wp:attachment":[{"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/media?parent=1028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/categories?post=1028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lmgc.univ-montp2.fr\/perso\/emilien-azema\/wp-json\/wp\/v2\/tags?post=1028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}