This document describes an ultrasonic wave propagation method for determining the storage components of the longitudinal complex modulus L<\/i>* and the shear complex modulus G<\/i>* of polymers at discrete frequencies typically in the range 0,5 MHz to 5 MHz. The method is suitable for measuring materials with storage moduli in the range 0,01 GPa to 200 GPa and with loss factors below 0,1 at around 1 MHz. With materials that have a higher loss, significant errors in velocity measurement are introduced through waveform distortion and can only be reduced using procedures that are outside the scope of this document.<\/p>\n
The method allows measurements to be made on small specimens, typically 50 mm \u00d7 20 mm \u00d7 5 mm, or small regions of larger specimens or sheets. It is therefore possible to obtain information on the homogeneity or anisotropy (see 10.5<\/span>) of modulus in a specimen.<\/p>\n Plastics. Determination of dynamic mechanical properties – Longitudinal and shear vibration. Wave-propagation method<\/b><\/p>\nPDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 2<\/td>\n National foreword <\/td>\n<\/tr>\n \n 6<\/td>\n Foreword <\/td>\n<\/tr>\n \n 7<\/td>\n 1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n\n 8<\/td>\n 4 Principle
5 Testing device
5.1 Apparatus <\/td>\n<\/tr>\n\n 9<\/td>\n 5.1.1 Method A: Immersion method
5.1.2 Method B: Transducer contact method
5.2 Transducers
5.3 Transit-time measurement equipment <\/td>\n<\/tr>\n\n 10<\/td>\n 5.4 Temperature measurement and control
6 Test specimens
6.1 General
6.2 Shape and dimensions
6.3 Preparation
7 Number of specimens
8 Conditioning
9 Procedure
9.1 Test atmosphere <\/td>\n<\/tr>\n\n 11<\/td>\n 9.2 Measuring the specimen dimension
9.3 Performing the test
9.3.1 Method A: Immersion method
9.3.2 Method B: Transducer contact method <\/td>\n<\/tr>\n\n 12<\/td>\n 9.3.3 Measurement of the specimen density
9.4 Varying the temperature
10 Expression of the results
10.1 Symbols
10.2 Determination of the longitudinal wave velocity vL
10.2.1 Method A: Immersion method <\/td>\n<\/tr>\n\n 13<\/td>\n 10.2.2 Method B: Transducer contact method
10.3 Determination of the transverse wave velocity vT
10.3.1 Method A: Immersion method <\/td>\n<\/tr>\n\n 14<\/td>\n 10.3.2 Method B: Transducer contact method
10.4 Calculation of dynamic properties
10.5 Influence of material anisotropy <\/td>\n<\/tr>\n\n 15<\/td>\n 11 Precision
12 Test report <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2019<\/td>\n 18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":306004,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1177,2641],"product_tag":[],"class_list":{"0":"post-305998","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-83-080-01","7":"product_cat-bsi","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\/305998","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\/306004"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=305998"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=305998"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=305998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}