{"id":47437,"date":"2024-11-19T10:00:47","date_gmt":"2024-11-19T09:00:47","guid":{"rendered":"https:\/\/www.bonomiacciai.it\/la-resilienza-dei-materiali\/"},"modified":"2025-05-22T14:32:00","modified_gmt":"2025-05-22T12:32:00","slug":"the-resilience-of-materials","status":"publish","type":"post","link":"https:\/\/www.bonomiacciai.it\/en\/the-resilience-of-materials\/","title":{"rendered":"The Resilience of Materials"},"content":{"rendered":"
[vc_row][vc_column][vc_column_text css=””]Resilience<\/strong> is a crucial mechanical property that determines a material’s capacity to absorb energy during both elastic and plastic deformations. It’s essential to understand this characteristic, also known as “impact toughness”<\/strong> or “impact strength,”<\/strong> for materials that must withstand shocks or impacts. This property is tested using the Charpy impact test<\/strong>.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/4″][\/vc_column][vc_column width=”1\/2″][vc_single_image image=”45021″ add_caption=”yes” onclick=”img_link_large” css=””][\/vc_column][vc_column width=”1\/4″][\/vc_column][\/vc_row][vc_row][vc_column]
<\/div>[\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”Why Perform Resilience Tests?” use_theme_fonts=”yes” css=””][vc_empty_space height=”16px”][vc_column_text css=””]Impact toughness tests are fundamental to ensure a material has the right capacity to resist impacts, preventing the propagation of cracks that could lead to fracture. Therefore, resilience should not be confused with ductility, which represents the ability to absorb energy through plastic deformation and is the characteristic that delays and reduces crack nucleation, stemming from the quality of the metallurgical processes that led to the metal’s fabrication.[\/vc_column_text][vc_empty_space height=”16px”][\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”The Charpy test.” use_theme_fonts=”yes” css=””][vc_empty_space height=”16px”][vc_column_text css=””]The most commonly used test method to evaluate resilience is the Charpy impact test<\/strong>, where the energy required to break a standard specimen with a single blow is measured. This value, expressed in Joules [J], represents the material’s impact resistance<\/strong> and provides a precise indication of its resilience<\/strong>.[\/vc_column_text][vc_empty_space height=”16px”][vc_row_inner][vc_column_inner width=”1\/4″][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”45008″ img_size=”medium” add_caption=”yes” alignment=”center” onclick=”img_link_large” css=””][\/vc_column_inner][vc_column_inner width=”1\/4″][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”Preparation of Test Tubes and Types of Carving.” use_theme_fonts=”yes” css=””][vc_empty_space height=”16px”][vc_column_text css=””]The test pieces used for resilience tests can have different types of notches:[\/vc_column_text][vc_empty_space height=”16px”][vc_column_text css=””]\n
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  • KV<\/strong>: 45\u00b0 V-notch, 2 mm deep, in accordance with UNI EN 10045\/1.<\/li>\n
  • KU<\/strong>: U-notch, 5 mm deep, according to UNI EN 10045\/1.<\/li>\n
  • KVW<\/strong>: Unnotched specimen, used to measure ductility.<\/li>\n<\/ul>\n[\/vc_column_text][vc_empty_space height=”16px”][vc_column_text css=””]The standard specimen has a length of 55 mm and a square cross-section of 10 mm. Reduced-section specimens, with widths of 7.5 mm or 5 mm, are also available.[\/vc_column_text][vc_empty_space][vc_row_inner][vc_column_inner width=”1\/2″][vc_single_image image=”45023″ img_size=”medium” add_caption=”yes” alignment=”center” onclick=”img_link_large” css=””][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”45024″ img_size=”medium” add_caption=”yes” alignment=”center” onclick=”img_link_large” css=””][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”Factors that Influence Resilience.” use_theme_fonts=”yes” css=””][vc_empty_space height=”16px”][vc_column_text css=””]\n
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    The resilience of a material can be influenced by various microstructural characteristics<\/strong>, introduced through heat treatments. Factors such as non-metallic inclusions<\/strong> (sulfides, oxides, silicates) and segregations within the metal<\/strong> act as initiators for crack nucleation, compromising the material’s ability to resist shocks and impacts. For this reason, the use of remelted steels<\/strong> is preferred.<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]
    <\/div>[\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”The Resilience of Materials: conclusion.” use_theme_fonts=”yes” css=””][vc_empty_space height=”16px”][vc_column_text css=””]Impact toughness tests are a fundamental tool for evaluating a material’s resistance to impact<\/strong>.[\/vc_column_text][\/vc_column][\/vc_row][vc_row full_width=”stretch_row_content” css=”.vc_custom_1717678542423{background-color: #ebebeb !important;}” visibility=”hidden-phone”][vc_column]
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