Fatigue monitoring

A method for monitoring structure liable to fatigue by sustained loading, which may be repeated or cyclic, under which crack-like flaws may grow and lead to fatigue or fatigue-induced failure, comprises providing in a gauge which may be integral with or secured to the structure an initial flaw in a...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: NICHOLAS JOHN PRESCOTT, FREDERICK MICHAEL BURDEKIN
Format: Patent
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page
container_issue
container_start_page
container_title
container_volume
creator NICHOLAS JOHN PRESCOTT
FREDERICK MICHAEL BURDEKIN
description A method for monitoring structure liable to fatigue by sustained loading, which may be repeated or cyclic, under which crack-like flaws may grow and lead to fatigue or fatigue-induced failure, comprises providing in a gauge which may be integral with or secured to the structure an initial flaw in a position from which a crack will grow, under the loading, in a predetermined manner depending upon the loading, and monitoring growth of the crack to determine the condition of the structure. Apparatus for the same includes a tab-like gauge 201 or other appendage which has a flaw, preferably made by a fatiguing process, and means for prestressing the gauge so that it will correctly respond to the in service static load. An example given in a gauge for a wing spar which when the plane is grounded is under opposite static loading to when it is in the air in service. Gauge 201 has an initiated crack 202 and is attached to blocks 203 glued to the structure by pins 204. Prior to attachment, blocks 203 are urged apart to apply a predetermined stress by wedge elements 205. Means may be provided for adjusting the prestress. Alternatively prestressing may be provided by the stress-inducing or stress relieving techniques applied to the gauge body as by local heating. Various gauges are shown, which may be glued welded, bolted or pinned to the structure or to an intermediate plate attached to the structure. Resistance, magnetic or acoustic properties of a gauge may be monitored. Alternatively visual inspection of crack growth may be enhanced by a scale or coloured markings. Optical fibres across the crack growth path may monitor growth.
format Patent
fullrecord <record><control><sourceid>epo_EVB</sourceid><recordid>TN_cdi_epo_espacenet_GB2223855A</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>GB2223855A</sourcerecordid><originalsourceid>FETCH-epo_espacenet_GB2223855A3</originalsourceid><addsrcrecordid>eNrjZBBySyzJTC9NVcjNz8ssyS_KzEvnYWBNS8wpTuWF0twM8m6uIc4euqkF-fGpxQWJyal5qSXx7k5GRkbGFqamjsaEVQAAjLwfRg</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>Fatigue monitoring</title><source>esp@cenet</source><creator>NICHOLAS JOHN PRESCOTT ; FREDERICK MICHAEL BURDEKIN</creator><creatorcontrib>NICHOLAS JOHN PRESCOTT ; FREDERICK MICHAEL BURDEKIN</creatorcontrib><description>A method for monitoring structure liable to fatigue by sustained loading, which may be repeated or cyclic, under which crack-like flaws may grow and lead to fatigue or fatigue-induced failure, comprises providing in a gauge which may be integral with or secured to the structure an initial flaw in a position from which a crack will grow, under the loading, in a predetermined manner depending upon the loading, and monitoring growth of the crack to determine the condition of the structure. Apparatus for the same includes a tab-like gauge 201 or other appendage which has a flaw, preferably made by a fatiguing process, and means for prestressing the gauge so that it will correctly respond to the in service static load. An example given in a gauge for a wing spar which when the plane is grounded is under opposite static loading to when it is in the air in service. Gauge 201 has an initiated crack 202 and is attached to blocks 203 glued to the structure by pins 204. Prior to attachment, blocks 203 are urged apart to apply a predetermined stress by wedge elements 205. Means may be provided for adjusting the prestress. Alternatively prestressing may be provided by the stress-inducing or stress relieving techniques applied to the gauge body as by local heating. Various gauges are shown, which may be glued welded, bolted or pinned to the structure or to an intermediate plate attached to the structure. Resistance, magnetic or acoustic properties of a gauge may be monitored. Alternatively visual inspection of crack growth may be enhanced by a scale or coloured markings. Optical fibres across the crack growth path may monitor growth.</description><language>eng</language><subject>INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES ; MEASURING ; PHYSICS ; TESTING</subject><creationdate>1990</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19900418&amp;DB=EPODOC&amp;CC=GB&amp;NR=2223855A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19900418&amp;DB=EPODOC&amp;CC=GB&amp;NR=2223855A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>NICHOLAS JOHN PRESCOTT</creatorcontrib><creatorcontrib>FREDERICK MICHAEL BURDEKIN</creatorcontrib><title>Fatigue monitoring</title><description>A method for monitoring structure liable to fatigue by sustained loading, which may be repeated or cyclic, under which crack-like flaws may grow and lead to fatigue or fatigue-induced failure, comprises providing in a gauge which may be integral with or secured to the structure an initial flaw in a position from which a crack will grow, under the loading, in a predetermined manner depending upon the loading, and monitoring growth of the crack to determine the condition of the structure. Apparatus for the same includes a tab-like gauge 201 or other appendage which has a flaw, preferably made by a fatiguing process, and means for prestressing the gauge so that it will correctly respond to the in service static load. An example given in a gauge for a wing spar which when the plane is grounded is under opposite static loading to when it is in the air in service. Gauge 201 has an initiated crack 202 and is attached to blocks 203 glued to the structure by pins 204. Prior to attachment, blocks 203 are urged apart to apply a predetermined stress by wedge elements 205. Means may be provided for adjusting the prestress. Alternatively prestressing may be provided by the stress-inducing or stress relieving techniques applied to the gauge body as by local heating. Various gauges are shown, which may be glued welded, bolted or pinned to the structure or to an intermediate plate attached to the structure. Resistance, magnetic or acoustic properties of a gauge may be monitored. Alternatively visual inspection of crack growth may be enhanced by a scale or coloured markings. Optical fibres across the crack growth path may monitor growth.</description><subject>INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES</subject><subject>MEASURING</subject><subject>PHYSICS</subject><subject>TESTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1990</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZBBySyzJTC9NVcjNz8ssyS_KzEvnYWBNS8wpTuWF0twM8m6uIc4euqkF-fGpxQWJyal5qSXx7k5GRkbGFqamjsaEVQAAjLwfRg</recordid><startdate>19900418</startdate><enddate>19900418</enddate><creator>NICHOLAS JOHN PRESCOTT</creator><creator>FREDERICK MICHAEL BURDEKIN</creator><scope>EVB</scope></search><sort><creationdate>19900418</creationdate><title>Fatigue monitoring</title><author>NICHOLAS JOHN PRESCOTT ; FREDERICK MICHAEL BURDEKIN</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_GB2223855A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1990</creationdate><topic>INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES</topic><topic>MEASURING</topic><topic>PHYSICS</topic><topic>TESTING</topic><toplevel>online_resources</toplevel><creatorcontrib>NICHOLAS JOHN PRESCOTT</creatorcontrib><creatorcontrib>FREDERICK MICHAEL BURDEKIN</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>NICHOLAS JOHN PRESCOTT</au><au>FREDERICK MICHAEL BURDEKIN</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Fatigue monitoring</title><date>1990-04-18</date><risdate>1990</risdate><abstract>A method for monitoring structure liable to fatigue by sustained loading, which may be repeated or cyclic, under which crack-like flaws may grow and lead to fatigue or fatigue-induced failure, comprises providing in a gauge which may be integral with or secured to the structure an initial flaw in a position from which a crack will grow, under the loading, in a predetermined manner depending upon the loading, and monitoring growth of the crack to determine the condition of the structure. Apparatus for the same includes a tab-like gauge 201 or other appendage which has a flaw, preferably made by a fatiguing process, and means for prestressing the gauge so that it will correctly respond to the in service static load. An example given in a gauge for a wing spar which when the plane is grounded is under opposite static loading to when it is in the air in service. Gauge 201 has an initiated crack 202 and is attached to blocks 203 glued to the structure by pins 204. Prior to attachment, blocks 203 are urged apart to apply a predetermined stress by wedge elements 205. Means may be provided for adjusting the prestress. Alternatively prestressing may be provided by the stress-inducing or stress relieving techniques applied to the gauge body as by local heating. Various gauges are shown, which may be glued welded, bolted or pinned to the structure or to an intermediate plate attached to the structure. Resistance, magnetic or acoustic properties of a gauge may be monitored. Alternatively visual inspection of crack growth may be enhanced by a scale or coloured markings. Optical fibres across the crack growth path may monitor growth.</abstract><oa>free_for_read</oa></addata></record>
fulltext fulltext_linktorsrc
identifier
ispartof
issn
language eng
recordid cdi_epo_espacenet_GB2223855A
source esp@cenet
subjects INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
title Fatigue monitoring
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-23T17%3A39%3A20IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-epo_EVB&rft_val_fmt=info:ofi/fmt:kev:mtx:patent&rft.genre=patent&rft.au=NICHOLAS%20JOHN%20PRESCOTT&rft.date=1990-04-18&rft_id=info:doi/&rft_dat=%3Cepo_EVB%3EGB2223855A%3C/epo_EVB%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true