THE IMPACT OF THE CRACKS ON THE HARMONIC RESPONSE OF STIFFENED STEEL PLATES

Oguzhan  Das; Can Gonenli

doi:10.1590/1679-78256790

THE IMPACT OF THE CRACKS ON THE HARMONIC RESPONSE OF STIFFENED STEEL PLATES

Authors

Oguzhan Das Department of Motor Vehicles and Transportation Technologies, Dokuz Eylul University, Izmir, Turkey https://orcid.org/0000-0001-7623-9278
Can Gonenli Department of Machine Drawing and Construction, Ege University, Izmir, Turkey https://orcid.org/0000-0001-9163-1569

DOI:

https://doi.org/10.1590/1679-78256790

Abstract

STIFFENED PLATES ARE EMPLOYED IN VARIOUS ENGINEERING STRUCTURES INCLUDING AEROSPACE, CIVIL, NAVAL, ETC. THESE STRUCTURES MAY BE SUBJECTED TO HARMONIC LOADS. THEREFORE, IT IS ESSENTIAL TO UNDERSTAND THE HARMONIC RESPONSE OF A CRACKED STIFFENED STRUCTURE. THIS STUDY PRESENTS THE EFFECTS OF THE CRACK LOCATION ON THE FREE VIBRATION AND HARMONIC RESPONSE OF THE STIFFENED PLATES. FOR THIS PURPOSE, HORIZONTAL AND VERTICAL CRACKS ARE MODELLED THROUGHOUT THE FIXED FROM TWO-SIDE STRUCTURE. THE ANALYSES ARE PERFORMED VIA THE FINITE ELEMENT METHOD AND THE MODE SUPERPOSITION TECHNIQUE. THE NATURAL FREQUENCIES AND THE DISPLACEMENT RESPONSES OF THE CRACKED AND HEALTHY STRUCTURES ARE OBTAINED AND INTERPRETED. IT IS CONCLUDED THAT A HORIZONTAL CRACK CAN DECREASE THE THIRD NATURAL FREQUENCY BY 60% AS IT IS LOCATED IN THE CENTER OF THE STIFFENED PLATE THAT IS FIXED FROM ITS NONSTIFFENED EDGES. THUS, THE DISPLACEMENT RESPONSE OF THE STIFFENED STRUCTURES IS INCREASED BY 18% IN THE PRESENCE OF THE SIDE HORIZONTAL OR VERTICAL CRACKS, WHICH ARE LOCATED AT THE FREE ENDS OF THE STIFFENED STRUCTURES NO MATTER WHICH BOUNDARY CONDITION IS CONSIDERED.

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Published

2021-12-30

Issue

Vol. 19 No. 2 (2022)

Section

Articles

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