1.1 <\/b>This International Standard specifies a method for determining the in-plane shear modulus (G<\/i>12) of fibrereinforced<\/p>\n
plastic composites using a standard plate specimen. When applied to isotropic materials, the shear<\/p>\n
modulus measured is independent of direction.<\/p>\n
1.2 <\/b>The method is used to determine the shear modulus of the test specimens but not to determine the shear<\/p>\n
strength. It applies to a plate supported on two points on one diagonal and loaded on the other diagonal by the<\/p>\n
simultaneous movement of two loading points attached to a cross-beam.<\/p>\n
1.3 <\/b>The method is suitable for use with fibre-reinforced plastic composites with both thermoset and thermoplastic<\/p>\n
matrices.<\/p>\n
Due to the shear deformation being applied under flexural conditions, for laminated materials with different fibre<\/p>\n
formats and\/or different orientations, the layers of material must be well distributed across the section so that it is<\/p>\n
approximately "homogeneous" in the through-thickness direction.<\/p>\n
The principal material axes, if present, must be orientated normal to the plate edges (see 3.8).<\/p>\n
NOTE This method can be applied to unreinforced polymers and other materials (e.g. metals, ceramics and metal- or<\/p>\n
ceramic-matrix composites).<\/p>\n
For material fabricated using unidirectional plies, the shear modulus obtained using a multidirectional specimen<\/p>\n
(i.e. 0\u00b0\/90\u00b0\/_ 45\u00b0) is not the same as that obtained for unidirectional or cross-ply (0\u00b0\/90\u00b0) material.<\/p>\n
1.4 <\/b>The method is performed using specimens which may be moulded to the chosen dimensions, machined from<\/p>\n
test plates or machined from flat areas of products.<\/p>\n
1.5 <\/b>The method specifies preferred dimensions for the specimen. Tests which are carried out on specimens of<\/p>\n
other dimensions, or on specimens which are prepared under different conditions, may produce results which are<\/p>\n
not comparable. Other factors, such as the speed of testing and the conditioning of the specimens, can influence<\/p>\n
the results. Consequently, when comparative data are required, these factors must be carefully controlled and<\/p>\n
recorded.<\/p>\n
NOTE The stress-strain response in shear is very non-linear at higher strain levels. This test method determines the<\/p>\n
modulus within a low strain region and is not applicable to higher strains.<\/p>\n","protected":false},"excerpt":{"rendered":"
Fibre-reinforced plastic composites \u2014 Determination of the in-plane shear modulus by the plate twist method<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 1999-12<\/td>\n 16<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":594635,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1181,2634],"product_tag":[],"class_list":{"0":"post-594622","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-83-120","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/594622","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/594635"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=594622"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=594622"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=594622"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}