{"id":20097,"date":"2026-01-20T13:37:04","date_gmt":"2026-01-20T12:37:04","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20097"},"modified":"2026-01-20T13:37:04","modified_gmt":"2026-01-20T12:37:04","slug":"deformation-modulus","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/deformation-modulus","title":{"rendered":"Deformation modulus"},"content":{"rendered":"
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The deformation modulus is a central parameter when components made of concrete, masonry, natural stone, or metal are separated, split, or crushed. It describes how stiff a material behaves under load\u2014and thus largely determines how cracks form, how much stroke a tool requires, and what hydraulic drive power is appropriate. For planners and contractors in concrete demolition<\/strong>, special demolition<\/strong>, natural stone extraction, and rock excavation, the deformation modulus influences the judicious selection and use of concrete demolition shear<\/strong>, concrete splitter<\/strong>, hydraulic wedge splitter<\/strong>, hydraulic demolition shear<\/strong>, Multi Cutters, steel shear<\/strong> or tank cutters (e.g., Tank Cutter<\/a>) by Darda GmbH.<\/p>\n

Definition: What is meant by deformation modulus<\/h2>\n

The deformation modulus describes the relationship between applied stress and the resulting strain of a material in the (nearly) elastic range. In practice, the elastic modulus (E\u2011modulus, Young\u2019s modulus) is often intended: the stiffness of a material in tension or compression. In geotechnics and for rock, the term deformation modulus is also used for test-derived, component-oriented parameters that capture overall system behavior (for example, results from load plate test<\/strong> or triaxial tests). The larger the deformation modulus, the stiffer<\/em> the response: small strains at high stresses. A smaller deformation modulus means higher compliance and larger deformations before crack formation or damage occurs.<\/p>\n

Influence of the deformation modulus on the selection and application of cutting and splitting technology<\/h2>\n

Concrete splitter<\/strong> as well as hydraulic wedge splitter<\/strong>, including hydraulic rock and concrete splitters<\/a>, generate local tensile stresses that, in stiff, brittle materials (high E\u2011modulus, e.g., granite or high-strength concrete), quickly turn into cracks. Crack propagation is directional and controllable, the required stroke is smaller, but the necessary peak force is high. In softer or tougher materials (lower E\u2011modulus, e.g., mixed masonry, young or lightweight concrete), energy is initially stored in deformation; crack initiation succeeds, but requires more opening travel, an adjusted drilling pattern, and potentially multiple application points.<\/p>\n

Concrete demolition shear<\/strong> transfer compressive and bending actions via the jaws. In components with a high deformation modulus and low toughness, separation cracks form quickly; in more ductile systems (e.g., reinforced concrete) the bite is deeper and repeated application is advisable. The choice of jaw profile, rotational positioning, and the hydraulic pressure of the hydraulic power pack<\/strong> are aligned with component thickness, reinforcement ratio, and the expected stiffness level. In metal applications\u2014e.g., with steel shear<\/strong>, hydraulic demolition shear<\/strong>, or in tank dismantling<\/strong>\u2014shearing dominates; the deformation modulus influences spring\u2011back, kerf, and edge quality, which dictate positioning and the required cutting stroke.<\/p>\n

Test methods and parameters in concrete, masonry, rock, and steel<\/h2>\n

Determination of the deformation modulus depends on material and objective. In practice, indicative values are useful and should be verified with site-specific tests.<\/p>\n

Typical magnitudes<\/h3>\n