In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW‐6082

Abstract

In the field of lightweight construction, hybrid structures such as reinforced metal matrix composites are highly qualified materials. The direct composite extrusion process allows for continuous manufacturing of wire reinforced aluminum matrix profiles. The aim is to increase the stiffness and specific strength in a way that the composite material shows better mechanical properties than the single matrix material. To determine and locate damage evolution during cyclic loading of spring steel reinforced EN AW‐6082 matrix the acoustic emission analysis is used. Furthermore it allows for getting more information about the damage mechanisms during fatigue of the matrix and the final failure of the reinforcing element. The current work also includes the determination of damage evolution using strain measuring methods.

Fatigue Behavior and Lifetime Prediction of Unidirectionally Wire Reinforced Lightweight Metal Matrix Composites

“…Since the current work involves the comparison of the results achieved in several studies, [10][11][12][13][14][15][16][17] investigated composite materials (and their corresponding matrix materials) with their testing frequency and the testing machine actuator used. Figure 3 gives an overview of the S/N curves in double logarithmic scale for all investigated unreinforced materials and 11.1 vol% reinforced composites.…”

“…[10][11][12][13][14][15][16][17] It could be confirmed that the reinforcing element leads to a significant increase in lifetime, noticeable by a parallel shift of the regression lines of the S-N curves in double logarithmic scale. [10][11][12][13][14][15][16][17] It could be confirmed that the reinforcing element leads to a significant increase in lifetime, noticeable by a parallel shift of the regression lines of the S-N curves in double logarithmic scale.…”

“…[10][11][12][13][14][15][16][17] It could be confirmed that the reinforcing element leads to a significant increase in lifetime, noticeable by a parallel shift of the regression lines of the S-N curves in double logarithmic scale. In refs., [10][11][12][13][14][15] metallographic investigations proved that crack initiation starts from the outer matrix surface of EN AW-60xx and AZ31 reinforced with 11.1 vol% spring steel wire specimens. The cracks continued to grow until they reached the reinforcing element.…”

“…In refs., [10][11][12][13][14][15] metallographic investigations proved that crack initiation starts from the outer matrix surface of EN AW-60xx and AZ31 reinforced with 11.1 vol% spring steel wire specimens. [10,12,14] In refs., [10][11][12]14] altogether four stages of deformation and damage could be identified with the help of the evolution of the plastic strain amplitude and a damage parameter based on the loss in stiffness. The crack growth of metallic rope reinforced EN AW-6060 [15] and spring steel wire reinforced EN AW-2099 and EN AW-6056 [16,17] started from the interface between matrix and reinforcing element.…”

“…A detailed view on the damage behavior under fatigue loading of spring steel wire reinforced EN AW-6082 and AZ31 examined by means of the acoustic emission analysis has been given in refs. [10,12,14] In refs., [10][11][12]14] altogether four stages of deformation and damage could be identified with the help of the evolution of the plastic strain amplitude and a damage parameter based on the loss in stiffness. [18] After strain hardening of the matrix material in stage I, stage II represents the (quasi) saturation stage.…”