{"id":41814,"date":"2020-03-16T09:07:08","date_gmt":"2020-03-16T09:07:08","guid":{"rendered":"\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/"},"modified":"2020-03-16T09:07:08","modified_gmt":"2020-03-16T09:07:08","slug":"finding-damping-ratio-theoretically","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/","title":{"rendered":"Finding Damping ratio theoretically"},"content":{"rendered":"<p>I am trying<strong> to determine the material damping ratio(hysteretic) of a material using ANSYS<\/strong>. I already know its Young&#8217;s modulus, Poisson&#8217;s ratio, Shear modulus and its density; and the material is isotropic.<\/p>\n<p><\/p>\n<p>I performed modal analysis on the material of a rectangular cross section(40mmx10mm), length 500mm and fixed at one end(cantilever) and found its first natural frequency.<\/p>\n<p><\/p>\n<p>I came across the half power bandwidth method and hence I tried harmonic analysis by applying a force of 1000N at the free end.<\/p>\n<p><\/p>\n<p>The amplitude goes to infinity(like 1000 meters) near and at the first natural frequency.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>How can <strong>I determine the structural damping ratio from these values from this harmonic frequency response curve?<\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-41814","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to determine the material damping ratio(hysteretic) of a material using ANSYS. I already know its Young&#039;s modulus, Poisson&#039;s ratio, Shear modulus and its density; and the material is isotropic. I performed modal analysis on the material of a rectangular cross section(40mmx10mm), length 500mm and fixed at one end(cantilever) and found its first\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Finding Damping ratio theoretically | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am trying to determine the material damping ratio(hysteretic) of a material using ANSYS. I already know its Young&#039;s modulus, Poisson&#039;s ratio, Shear modulus and its density; and the material is isotropic. I performed modal analysis on the material of a rectangular cross section(40mmx10mm), length 500mm and fixed at one end(cantilever) and found its first\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-03-16T09:07:08+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-03-16T09:07:08+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Finding Damping ratio theoretically | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am trying to determine the material damping ratio(hysteretic) of a material using ANSYS. I already know its Young&#039;s modulus, Poisson&#039;s ratio, Shear modulus and its density; and the material is isotropic. 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