A crack arrestor (otherwise known as a rip-stop doubler) is a structural engineering device. Being typically shaped into ring or strip, and composed of a strong material, it serves to contain stress corrosion cracking or fatigue cracking, helping to prevent the catastrophic failure of a device.
The crack arrestor can be as simple as a thickened region of metal, or may be constructed of a laminated or woven material that can be designed to withstand deformation without failure. When correctly applied, the technique is capable of redirecting movement and safely distributing stresses.[1] The crack arrestor is considered to be compatible with fail-safe design practices.[2]
Applicationsedit
Crack arrestors have seen extensive use in the aviation sector, particularly upon large pressurised aircraft as a means of guarding against progressive metal fatigue.[3] Specifically, the skin of the fuselage typically has a large number of high stress locations, rivetting being a leading cause, making these points of potential crack initiation. Calculations are frequently used to simulate crack propagation, as well as the effectiveness of mitigating measures, such as crack arrestors, in ensuring the aircraft can be safely operated.[3]
Following two catastrophic airframe failures in 1954, crack arrestors were used as additional reinforcement of the fuselage of the de Havilland Comet, although this was only one of several design changes made to address structural design weaknesses related to metal fatigue and skin stresses that had been previously unknown to the aviation industry.[4][5]
Naval vessels are another place where crack arrestors have been extensively used. As of the 2010s, the United States Navy frequently applies them to areas of the ship that have been damaged or otherwise have received repairs in order to ensure that the affected element is not lacking in either strength or durability. It has been acknowledged that ships primarily composed of aluminium are significantly more prone to crack propagation than older steel counterparts; thus, the use of mitigating measures is likely to become more commonplace.[6]
Crack arrestors have also been used in civil engineering. They have long been used in the nuclear industry as a structural element of reactors.[7] Numerous pipelines used from transporting chemicals have been reinforced with such devices to protect against bursting and exterior damage alike.[8] While commonly applied to metal alloys, appropriately designed crack arrestors have been used with composite materials as well.[9][10] During 2008, Airbus Group was awarded a patent for a new design technique for a crack arrestor component.[11]
Citationsedit
^"High strain deformation" (PDF). uobabylon.edu.iq. 20 June 2020.
^Sairam Kotari; S.M. Gangadhar; A. Amala; P. Poornima; P. Janaki Ramulua (1 February 2014). "Design and Analysis of Crack Stopper" (PDF). International Journal of Current Engineering and Technology.
^ abVenkatesha, B K (January 2012). "Analytical Evaluation of Fatigue Crack Arrest Capability in Fuselage of Large Transport Aircraft". pp. 13–22.
^R.J. Atkinson; W.J. Winkworth; G.M. Norris (1962). "Behaviour of Skin Fatigue Cracks at the Corners of Windows in a Comet Fuselage". Aeronautrical Research Council Reports and Memoranda. CiteSeerX10.1.1.226.7667.
^Faith, Nicholas (1996). Black Box: Why Air Safety is no Accident, The Book Every Air Traveller Should Read. London: Boxtree. p. 72. ISBN0-7522-2118-3.
^"Effective Crack Arrestors for On-Board Fatigue Crack Repair of Aluminum Ship Structures". Department of Defense. 17 February 2016.
^G. R. Irwin; J. M. Krafft; P. C. Paris; A. A. Wells (21 November 1967). (PDF). apps.dtic.mil. Archived from the original (PDF) on March 24, 2020.
^Brauer, H.; Knauf, G.; Hillenbrand, H.-G. (9–12 May 2004). (PDF). Ostend, Belgium: 4th International Conference on Pipeline Technology. Archived from the original (PDF) on 7 July 2011. Retrieved 11 June 2010.
^Harris, Bryan (2003). Fatigue in composites: Science and technology of the fatigue response of fibre-reinforced plastics(PDF). Cambridge, England: Woodhead Publishing. p. 198. ISBN1-85573-608-X – via dl.polycomposite.ir.
^Thomas Kruse; Thomas Körwien; Roman Ruzek; Robert Hangx; Calvin Rans (2007). "Fatigue behavior and damage tolerant design of bonded joints for aerospace application on Fiber Metal Laminates and composites" (PDF). 29th ICAF Symposium.
^"DE102008023495A1: Component for an aircraft structure, method for producing a component for an aircraft structure and use of the component as a crack stopper". 2008.
This engineering-related article is a stub. You can help Wikipedia by expanding it.
crack, arrestor, crack, arrestor, otherwise, known, stop, doubler, structural, engineering, device, being, typically, shaped, into, ring, strip, composed, strong, material, serves, contain, stress, corrosion, cracking, fatigue, cracking, helping, prevent, cata. A crack arrestor otherwise known as a rip stop doubler is a structural engineering device Being typically shaped into ring or strip and composed of a strong material it serves to contain stress corrosion cracking or fatigue cracking helping to prevent the catastrophic failure of a device The crack arrestor can be as simple as a thickened region of metal or may be constructed of a laminated or woven material that can be designed to withstand deformation without failure When correctly applied the technique is capable of redirecting movement and safely distributing stresses 1 The crack arrestor is considered to be compatible with fail safe design practices 2 Applications editCrack arrestors have seen extensive use in the aviation sector particularly upon large pressurised aircraft as a means of guarding against progressive metal fatigue 3 Specifically the skin of the fuselage typically has a large number of high stress locations rivetting being a leading cause making these points of potential crack initiation Calculations are frequently used to simulate crack propagation as well as the effectiveness of mitigating measures such as crack arrestors in ensuring the aircraft can be safely operated 3 Following two catastrophic airframe failures in 1954 crack arrestors were used as additional reinforcement of the fuselage of the de Havilland Comet although this was only one of several design changes made to address structural design weaknesses related to metal fatigue and skin stresses that had been previously unknown to the aviation industry 4 5 Naval vessels are another place where crack arrestors have been extensively used As of the 2010s the United States Navy frequently applies them to areas of the ship that have been damaged or otherwise have received repairs in order to ensure that the affected element is not lacking in either strength or durability It has been acknowledged that ships primarily composed of aluminium are significantly more prone to crack propagation than older steel counterparts thus the use of mitigating measures is likely to become more commonplace 6 Crack arrestors have also been used in civil engineering They have long been used in the nuclear industry as a structural element of reactors 7 Numerous pipelines used from transporting chemicals have been reinforced with such devices to protect against bursting and exterior damage alike 8 While commonly applied to metal alloys appropriately designed crack arrestors have been used with composite materials as well 9 10 During 2008 Airbus Group was awarded a patent for a new design technique for a crack arrestor component 11 Citations edit High strain deformation PDF uobabylon edu iq 20 June 2020 Sairam Kotari S M Gangadhar A Amala P Poornima P Janaki Ramulua 1 February 2014 Design and Analysis of Crack Stopper PDF International Journal of Current Engineering and Technology a b Venkatesha B K January 2012 Analytical Evaluation of Fatigue Crack Arrest Capability in Fuselage of Large Transport Aircraft pp 13 22 R J Atkinson W J Winkworth G M Norris 1962 Behaviour of Skin Fatigue Cracks at the Corners of Windows in a Comet Fuselage Aeronautrical Research Council Reports and Memoranda CiteSeerX 10 1 1 226 7667 Faith Nicholas 1996 Black Box Why Air Safety is no Accident The Book Every Air Traveller Should Read London Boxtree p 72 ISBN 0 7522 2118 3 Effective Crack Arrestors for On Board Fatigue Crack Repair of Aluminum Ship Structures Department of Defense 17 February 2016 G R Irwin J M Krafft P C Paris A A Wells 21 November 1967 Basic Aspects of Crack Growth and Fracture PDF apps dtic mil Archived from the original PDF on March 24 2020 Brauer H Knauf G Hillenbrand H G 9 12 May 2004 Crack arrestors PDF Ostend Belgium 4th International Conference on Pipeline Technology Archived from the original PDF on 7 July 2011 Retrieved 11 June 2010 Harris Bryan 2003 Fatigue in composites Science and technology of the fatigue response of fibre reinforced plastics PDF Cambridge England Woodhead Publishing p 198 ISBN 1 85573 608 X via dl polycomposite ir Thomas Kruse Thomas Korwien Roman Ruzek Robert Hangx Calvin Rans 2007 Fatigue behavior and damage tolerant design of bonded joints for aerospace application on Fiber Metal Laminates and composites PDF 29th ICAF Symposium DE102008023495A1 Component for an aircraft structure method for producing a component for an aircraft structure and use of the component as a crack stopper 2008 nbsp This engineering related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Crack arrestor amp oldid 1163581624, wikipedia, wiki, book, books, library,
