Failure analysis of bolted laminated composite plates

In this study, failure analyses were performed using progressive damage model to determine the tensile strength of bolted laminated composite plates with high accuracy. Progressive damage model was prepared using ANSYS APDL. Finite element failure analyses were performed using Hashin’s failure criteria. Results of the analyses were compared with the experimental studies available in literature and an excellent agreement was found between the results of the analyses and experimental data. Additionally, changing the plate width/ hole diameter ratio (W/D) between 2-4 and edge distance/hole diameter ratio (E/D) between 1-4, the effects of geometric parameters on the load carrying capacity of the composite plate were investigated and maximum tensile failure loads were determined. For W/D and E/D ratios equal to 2, failure propagated towards the free end of the plate showing shear failure mode. For For W/D and E/D ratios greater than 2, bearing failure mode occurred. For [02/902]s configuration no net-tension failure mode occurred in the composite plate and for W/D and E/D ratios equal to 3 maximum bearing strength achieved.

Cývata baðlantýlý tabakalý kompozit levhalarda hasar analizi

Bu çalýþmada, cývata baðlantýlý tabakalý kompozit levhalarda çekme dayanýmýný yüksek doðrulukta tespit edebilmek amacýyla kademeli hasar ilerleme modeli kullanýlarak hasar analizi uygulanmýþtýr. Hasar ilerleme modeli ANSYS APDL kullanýlarak hazýrlanmýþtýr. Hashin hasar kriterleri kullanýlarak sonlu elemanlar analizleri gerçekleþtirilmiþtir. Analiz sonuçlarý literatürde yer alan deneysel çalýþmalar ile karþýlaþtýrýlmýþ ve çok yakýn sonuçlar elde edilmiþtir. Ayrýca plaka geniþliði/delik çapý oraný (W/D) 2’den 4’e kadar, kenar uzaklýðý/delik çapý oraný (E/D) ise 1’den 4’e kadar deðiþtirilerek geometrik etkilerin kompozit yapýnýn yük taþýma kapasitesine etkisi araþtýrýlmýþ ve maksimum çekme dayanýmlarý hesaplanmýþtýr. W/D ve E/D oranlarý 2 için hasar levhanýn serbest kenarýna doðru kayma (yýrtýlma) þeklinde ilerlemiþtir. W/D ve E/D oranlarý 2’den büyük olduðunda hasar ezilme (yatak hasarý) þeklinde gerçekleþmiþtir. [02/902]s konfigürasyonuna sahip kompozit levhada net çekme hasarý meydana gelmemiþtir. W/D ve E/D oranlarý 3 olduðunda kompozit levha maksimum yatak (ezilme) mukavemetine ulaþmaktadýr.