► Beryllium copper alloys have high mechanical strength and a favourable elastic modulus, which makes them highly suitable as a spring material.
► In general, if this value is too large, the contact pressure varies greatly with the slight movement of the contact. If this value is too small, the required contact pressure cannot be obtained.
► Since the YS/Young's modulus of beryllium copper is larger than that of stainless steels and phosphor bronze, a large displacement and a high contact pressure can be obtained.
► By fully utilizing such properties of beryllium copper alloys, the size of a part with the same spring pressure can be reduced if it is made of beryllium copper alloys compared with phosphor bronze.
► Molds or terminals around moving parts can be downsized, leading to the reduction of total product costs.
► Since beryllium copper has a mechanical strength as high as 1500 N/mm², the use of beryllium copper makes the pin pitch smaller, and even a connector of the same size and shape can be designed to higher density, reducing the cost per pin compared with phosphor bronze.
► The use of beryllium copper in jacks enables the reduction of size and weight. This decreases the amount of materials used and reduces costs for plating.
► When the total costs are compared, the use of beryllium copper is beneficial over the use of phosphor bronze.
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► The elastic modulus is usually the modulus of longitudinal elasticity, and is also known as Young's modulus. This value is obtained from the slope of strain against stress measured by a tensile test. In addition to the above test, the elastic modulus can be measured directly for flat springs.
► The elastic modulus is an important constant for the design of moving parts for connectors and switches.