Experimentally Quantifying the Dynamic Response of Bolted Lap Joints

2006 ◽  
Author(s):  
Steven Page ◽  
Oleg Shiryayev ◽  
Joseph Slater ◽  
Chris Pettit
Keyword(s):  
Dynamic Response ◽  
Lap Joints

Experimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints

2004 ◽  
Vol 126 (1) ◽  
pp. 84-91 ◽  
Author(s):  
A. Vaziri ◽  
H. Nayeb-Hashemi ◽  
H. R. Hamidzadeh
Keyword(s):  
Dynamic Response ◽  
Loss Factor ◽  
Natural Frequencies ◽  
Adhesive Layer ◽  
Lap Joints ◽  
Laser Vibrometer ◽  
Total System ◽  
Adhesive Film ◽  
Single Lap Joints ◽  
Central Void

Dynamic response of single lap joints, subjected to a harmonic peeling load is studied theoretically and experimentally. In the theoretical part, dynamic response of a single lap joint clamped at one end and subjected to a harmonic peeling load at the other end is investigated. Adherents are modeled as Euler-Bernouli beams joined in the lap area by a viscoelastic adhesive layer. Both axial and transverse deformations of adherents are considered in deriving the equations of motion. The effects of adhesive layer thickness, mechanical properties and its loss factor on the dynamic response of the joint are investigated. Furthermore, effects of defects such as a void in the lap area on the dynamic response of the joints are studied. The results showed that frequencies where peak amplitudes occurred were little dependent on the adhesive loss factor. However, peak amplitudes reduced for joints with a higher adhesive loss factor. Furthermore, the results indicated that for the joint geometries and properties investigated the system resonant frequencies were not affected by the presence of a central void covering up to 80% of the overlap length. In the experimental part, single lap joints were fabricated using 6061-T6 Aluminum. Adherents were joined together using Hysol EA 9689 adhesive film. Joints with various central voids were manufactured by removing adhesive film from the desired area of lap joints prior to bonding adherents. Dynamic responses of the joints were investigated using the hammer test technique. The system response was measured using both an accelerometer and a noncontact laser vibrometer. The natural frequencies of the joints obtained by using the laser vibrometer were very close to those obtained theoretically. However, natural frequencies obtained by using an accelerometer depended on the accelerometer location in the system, which was attributed to its mass contribution to the over- all system mass. A central void covering less than 80% of the overlap length had little effect on the system resonance frequencies. This was in agreement with the theoretical results. In contrast total system-damping ratios were a function of the void size. Joints without a void exhibited higher damping.

Experimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints

2002 ◽  
Author(s):  
A. Vaziri ◽  
H. Nayeb-Hashemi
Keyword(s):  
Dynamic Response ◽  
Loss Factor ◽  
Natural Frequencies ◽  
Adhesive Layer ◽  
Lap Joints ◽  
Laser Vibrometer ◽  
Total System ◽  
Adhesive Film ◽  
Single Lap Joints ◽  
Central Void

Dynamic response of single lap joints, subjected to a harmonic peeling load is studied theoretically and experimentally. In the theoretical part, dynamic response of a single lap joint clamped at one end and subjected to a harmonic peeling load at the other end is investigated. Adherents are modeled as Euler-Bernouli beams joined in the lap area by a viscoelastic adhesive layer. Both axial and transverse deformations of adherents are considered in deriving the equations of motion. The effects of adhesive layer thickness, mechanical properties and its loss factor on the dynamic response of the joint are investigated. Furthermore, effects of defects such as a void in the lap area on the dynamic response of the joints are studied. The results showed that frequencies where peak amplitudes occurred were little dependent on the adhesive loss factor. However, peak amplitudes reduced for joints with a higher adhesive loss factor. Furthermore, the results indicated that for the joint geometries and properties investigated the system resonant frequencies were not affected by the presence of a central void covering up to 80% of the overlap length. In the experimental part, single lap joints were fabricated using 6061-T6 Aluminum. Adherents were joined together using Hysol EA 9689 adhesive film. Joints with various central voids were manufacture by removing adhesive film from the desired area of lap joints prior to bonding adherents. Dynamic responses of the joints were investigated using the hammer test technique. The system response was measured using both an accelerometer and a non-contact laser vibrometer. The natural frequencies of the joints obtained by using the laser vibrometer were very close to those obtained theoretically. However, natural frequencies obtained by using an accelerometer depended on the accelerometer location in the system, which was attributed to its mass contribution to the over all system mass. A central void covering less than 80% of the overlap length had little effect on the system resonance frequencies. This was in agreement with the theoretical results. In contrast, total system-damping ratios were a function of the void size. Joints without a void exhibited higher damping.

Human pilot dynamic response in flight and simulator.

1958 ◽  
Author(s):  
Edward Seckel ◽  
Ian A. M. Hall ◽  
Duane T. McRuer ◽  
David H. Weir
Keyword(s):  
Dynamic Response

Memory effects in the dynamic response of a random two-spin Ising system

1991 ◽  
Vol 1 (1) ◽  
pp. 63-77 ◽  
Author(s):  
M. Nifle ◽  
H. J. Hilhorst
Keyword(s):  
Dynamic Response ◽  
Memory Effects ◽  
Ising System

Dynamic response of a blue phase to an applied field

1992 ◽  
Vol 2 (10) ◽  
pp. 1803-1809
Author(s):  
V. K. Dolganov ◽  
G. Heppke ◽  
H.-S. Kitzerow
Keyword(s):  
Dynamic Response ◽  
Applied Field ◽  
Blue Phase
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