Body flex (original) (raw)
Body flex is a lack of rigidity in a motor vehicle's chassis. It is often something to be avoided by car manufacturers as higher levels of body flex is a sign of structural weakness, and means that the vehicle's suspension cannot work as efficiently - the body takes up some of the 'slack', rather than the parts of the car which were specifically designed for this purpose. A chassis that flexes may be prone to fatigue and further "softening" with use will eventually result in failure. Cars of a sporting nature are, therefore, often very 'stiff', while convertibles or cabriolets are not often considered to be good candidates for high-performance sports cars because of their lack of a rigid roof.
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| dbo:abstract | Body flex is a lack of rigidity in a motor vehicle's chassis. It is often something to be avoided by car manufacturers as higher levels of body flex is a sign of structural weakness, and means that the vehicle's suspension cannot work as efficiently - the body takes up some of the 'slack', rather than the parts of the car which were specifically designed for this purpose. A chassis that flexes may be prone to fatigue and further "softening" with use will eventually result in failure. Cars of a sporting nature are, therefore, often very 'stiff', while convertibles or cabriolets are not often considered to be good candidates for high-performance sports cars because of their lack of a rigid roof. Although, for some time, body flex was a result of attempts to keep a car's weight down, makers such as Audi (the A8), and Jaguar (with the 2003 XJ8) have employed the use of aluminium in chassis production to get around this obstacle, ensuring the weight of these cars and their level of body flex can both be kept to a minimum. Typically, the stiffness of the body is measured in torsion. The body is supported at the spring caps at the rear, and then a torque is applied to the front spring caps via a long beam and a fulcrum. Values achieved range from 1,000 lb⋅ft (1,400 N⋅m) per degree for pre-War racing cars, up to 25,000 lb⋅ft (33,900 N⋅m) per degree for some modern production vehicles. (en) Karosseriflex innebär brist på styvhet hos ett motorfordonschassi. Det bör som regel undvikas vid utformning av personbilar. Orsaken är att flexning är ett tecken på strukturell svaghet, och innebär att bilens fjädring inte kan arbeta så effektivt - karossen tar upp "glapp", snarare än de delar av bilen som är särskilt utformade för det syftet. Hos tunga fordon är flexrörelser i ramen inte bara oundvikliga. Det kan också vara en förutsättning för framkomlighet vid t.ex. anläggningskörning. Ett problem i sammanhanget är att dessa s.k. frame beaming vibrationer bidrar till att yrkesförare kan utsättas för helkroppsvibration över Arbetsmiljöverkets Insatsvärde. Ett chassi som flexar kan drabbas av utmattningsskador i form av sprickor och fortsatt "uppmjukning" som på sikt leder till mekaniskt haveri. Sportiga bilar är utformade för att vara mycket styva, medan vardagsbilar och i synnerhet cabrioleter oftast är mer flexibla. Moderna standardbilar är dock uppemot 25 ggr styvare än en tävlingsbil från tiden före andra världskriget. (sv) |
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| dbo:wikiPageWikiLink | dbr:Motor_vehicle dbr:Convertible_(car) dbr:Stiffness dbr:Aluminium dbc:Automotive_engineering dbr:Chassis dbr:Jaguar_XJ dbr:Audi dbr:Audi_A8 dbr:Jaguar_(car) dbr:Flexibility_(engineering) dbr:Suspension_(vehicle) dbr:Sports_cars dbr:Cabriolet_(automobile) dbr:Car_manufacturer |
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| rdfs:comment | Body flex is a lack of rigidity in a motor vehicle's chassis. It is often something to be avoided by car manufacturers as higher levels of body flex is a sign of structural weakness, and means that the vehicle's suspension cannot work as efficiently - the body takes up some of the 'slack', rather than the parts of the car which were specifically designed for this purpose. A chassis that flexes may be prone to fatigue and further "softening" with use will eventually result in failure. Cars of a sporting nature are, therefore, often very 'stiff', while convertibles or cabriolets are not often considered to be good candidates for high-performance sports cars because of their lack of a rigid roof. (en) Karosseriflex innebär brist på styvhet hos ett motorfordonschassi. Det bör som regel undvikas vid utformning av personbilar. Orsaken är att flexning är ett tecken på strukturell svaghet, och innebär att bilens fjädring inte kan arbeta så effektivt - karossen tar upp "glapp", snarare än de delar av bilen som är särskilt utformade för det syftet. (sv) |
| rdfs:label | Body flex (en) Karosseriflex (sv) |
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