CCT Surface Preparation & Bonding Techniques Flashcards
6 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCT Surface Preparation & Bonding Techniques flashcards as text
How does bondline thickness affect the strength of composite adhesive joints?
Answer: Thicker bondlines generally reduce shear strength due to stress concentration
Thicker bondlines reduce shear and peel strength due to stress concentration effects, so controlled uniform bondline thickness is critical to joint performance.
What causes porosity in adhesive bondlines?
Answer: Entrapped air, moisture, or volatiles during adhesive application
Porosity in bondlines results from entrapped air bubbles, moisture vaporization, or volatile byproducts released and trapped during the adhesive cure.
In a lap shear joint, what type of stress is the adhesive primarily subjected to?
Answer: Shear
Lap shear joints load the adhesive primarily in shear, making shear strength the governing design parameter for this common joint configuration.
What does adhesive 'squeeze-out' indicate during composite part assembly?
Answer: Sufficient adhesive was applied and the bondline is properly filled
Squeeze-out at the joint perimeter when parts are clamped indicates adequate adhesive coverage and that the bondline gap is properly filled.
Which NDI method is most effective for detecting disbonds in composite adhesive joints?
Answer: Ultrasonic testing (pulse-echo or through-transmission)
Ultrasonic testing, either pulse-echo or through-transmission, is most effective for detecting disbonds because sound waves reflect off bond interruptions and voids.
What is the purpose of a bond primer in composite adhesive repair applications?
Answer: To act as a corrosion inhibitor and improve adhesive wetting on the surface
Bond primers function as corrosion inhibitors and coupling agents that improve adhesive wetting and long-term adhesion to the substrate surface.