國立虎尾科技大學 |

Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures : = A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC).

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures :/
其他題名:	A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC).
作者:	Amanuel, Yared.
面頁冊數:	1 online resource (263 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
標題:	Materials science. -
電子資源:	click for full text (PQDT)
ISBN:	9798379785123

Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures : = A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC).
Amanuel, Yared.

Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures :A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC). - 1 online resource (263 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--University of Maryland, Baltimore County, 2023.

Includes bibliographical references

Numerical computational methods to predict fracture fatigue life of functional materials are cost effective when compared to experimental-based prediction approaches. However, the validity of a numerical fracture fatigue solution for welded aluminum structures depends on its agreement with experimentally obtained results. Obtaining physical experimental results is a challenge for fracture fatigue life at the structural scale because it requires the identification, isolation, and testing evaluation of various factors influencing crack growth, such as material properties, environmental conditions, loading spectrum, residual stresses, etc. There are well established testing standards (e.g., ASTM) designed to quantify the effect of these factors; however, the appropriate scaling of benchtop results to a suitable structural scale is not well understood. Hence, it is common practice to physically test full scale structures (e.g., ships) to gain knowledge of the fracture fatigue life of the components. This can be cost prohibitive. The aims of the work presented here are to: 1) develop and verify a digital image correlation (DIC) based crack length measurement technique for fracture fatigue life testing and 2) develop an application of the DIC based measuring technique for use in the investigation of the effect of geometry on fracture fatigue life response of aluminum 5083 H116.The initial investigation of the concept for using DIC as a fracture fatigue life measurement technique demonstrated the feasibility of the DIC approach, i.e., the construction of a plot of crack length as a function of loading cycle for a Monitored Aluminum Health Investigation (MAHI) component. In addition, the technique can continuously measure crack growth to give insight regarding crack length growth at a finer time scale. The verification of DIC and the ability to measure strain at low service loads were confirmed. Strain results obtained via DIC were in good agreement with measurements of strain obtained from electrical resistance strain measurements. DIC's capability to measure the full field strains was employed to investigate the effect of welds and crack-like flaws, and established unique fingerprint-like characteristics that can be used to identify and inspect structural details of welds and cracks.The aluminum fracture fatigue experiments were conducted at constant amplitude with a stress ratio (R) of 0.1 on six different welded aluminum 5083 H116 specimen types with a through thickness crack at the center. DIC established the crack growth as a function of the number of cycles (i.e., the crack growth rate). Extended finite element mothed (XFEM) was able to predict the general profile of the crack length growth when compared to DIC results. However, there were differences between the predicted and experimentally obtained results, ranging from 17 % to 251 %. The groups with no stiffener showed a 36 % reduction in life when compared to the groups with stiffeners. Samples with stiffener removed and no buttweld had the lowest life with 13,185 cycles (± 661 standard deviation), and samples with stiffeners with buttweld had the highest life (60,000+). This work has developed an effective fracture fatigue life experimental design approach and measuring technique to improve predictive capabilities to assess damage in structures.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379785123Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

Prediction approachesIndex Terms--Genre/Form:

554714
Electronic books.

Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures : = A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC).
LDR:04925ntm a2200385K 4500 001 1141113
005 20231130111616.5
006 m o d
007 cr mn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798379785123
035 $a (MiAaPQ)AAI30485687
035 $a AAI30485687
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Amanuel, Yared. $3 1464723
245 1 0 $a Fracture Fatigue Life Prediction of Geometrically Varied Multi-Scaled 5083 H116 Welded Aluminum Structures : $b A Numerical Analysis Using Extended Finite Element Method (XFEM) and Experimental Verification Using Digital Image Correlation (DIC).
264 0 $c 2023
300 $a 1 online resource (263 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
500 $a Advisor: Topoleski, L. D. Timmie.
502 $a Thesis (Ph.D.)--University of Maryland, Baltimore County, 2023.
504 $a Includes bibliographical references
520 $a Numerical computational methods to predict fracture fatigue life of functional materials are cost effective when compared to experimental-based prediction approaches. However, the validity of a numerical fracture fatigue solution for welded aluminum structures depends on its agreement with experimentally obtained results. Obtaining physical experimental results is a challenge for fracture fatigue life at the structural scale because it requires the identification, isolation, and testing evaluation of various factors influencing crack growth, such as material properties, environmental conditions, loading spectrum, residual stresses, etc. There are well established testing standards (e.g., ASTM) designed to quantify the effect of these factors; however, the appropriate scaling of benchtop results to a suitable structural scale is not well understood. Hence, it is common practice to physically test full scale structures (e.g., ships) to gain knowledge of the fracture fatigue life of the components. This can be cost prohibitive. The aims of the work presented here are to: 1) develop and verify a digital image correlation (DIC) based crack length measurement technique for fracture fatigue life testing and 2) develop an application of the DIC based measuring technique for use in the investigation of the effect of geometry on fracture fatigue life response of aluminum 5083 H116.The initial investigation of the concept for using DIC as a fracture fatigue life measurement technique demonstrated the feasibility of the DIC approach, i.e., the construction of a plot of crack length as a function of loading cycle for a Monitored Aluminum Health Investigation (MAHI) component. In addition, the technique can continuously measure crack growth to give insight regarding crack length growth at a finer time scale. The verification of DIC and the ability to measure strain at low service loads were confirmed. Strain results obtained via DIC were in good agreement with measurements of strain obtained from electrical resistance strain measurements. DIC's capability to measure the full field strains was employed to investigate the effect of welds and crack-like flaws, and established unique fingerprint-like characteristics that can be used to identify and inspect structural details of welds and cracks.The aluminum fracture fatigue experiments were conducted at constant amplitude with a stress ratio (R) of 0.1 on six different welded aluminum 5083 H116 specimen types with a through thickness crack at the center. DIC established the crack growth as a function of the number of cycles (i.e., the crack growth rate). Extended finite element mothed (XFEM) was able to predict the general profile of the crack length growth when compared to DIC results. However, there were differences between the predicted and experimentally obtained results, ranging from 17 % to 251 %. The groups with no stiffener showed a 36 % reduction in life when compared to the groups with stiffeners. Samples with stiffener removed and no buttweld had the lowest life with 13,185 cycles (± 661 standard deviation), and samples with stiffeners with buttweld had the highest life (60,000+). This work has developed an effective fracture fatigue life experimental design approach and measuring technique to improve predictive capabilities to assess damage in structures.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
650 4 $a Mechanical engineering. $3 557493
653 $a Prediction approaches
653 $a Fracture fatigue
653 $a Material properties
653 $a Welded aluminum
653 $a Digital image correlation
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
690 $a 0794
710 2 $a University of Maryland, Baltimore County. $b Engineering, Mechanical. $3 1178896
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Dissertations Abstracts International $g 85-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30485687 $z click for full text (PQDT)