Laser testing of a bond interface between two dissimilar materials
AssigneeThe Boeing Company
InventorsRichard Henry Bossi, Alan Frank Stewart, Marc Joel Piehl
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Abstract
A method and apparatus for testing a bond interface is provided. The method comprises directing laser energy at a first surface of a first material connected to a second material by an adhesive at a bond interface. The first surface is opposite the bond interface. A first acoustic impedance of the first material is greater than a second acoustic impedance of the second material. The method also determines whether an inconsistency is present in the bond interface after directing the laser energy.
Claims13
A method for laser testing of a bond interface between two dissimilar materials, the method comprising:
- directing a pulse width of laser energy between about 5 nanosec to about 15 nanosec at a first surface of a first material connected to a second material by an adhesive at a bond interface, wherein the first surface is opposite the bond interface, wherein the first material and the second material are dissimilar and a first acoustic impedance of the first material is greater than a second acoustic impedance of the second material;
- wherein a compression wave is transmitted into the first surface of the first material and the compression wave is reflected from the bond interface as a tension wave to cause a rarefaction at the bond interface based on a difference between the first acoustic impedance and the second acoustic impedance;
- and
- wherein reflection of the tension wave at the bond interface builds very quickly and the first surface of the first material rebounds quickly creating the rarefaction and a pulling away from the adhesive and the second material.
A method comprising:
- transmitting an initial wave into a first surface of a first material connected to a second material by an adhesive at a bond interface, wherein the first surface is opposite the bond interface, and wherein a first acoustic impedance of the first material is greater than a second acoustic impedance of the second material;
- creating a tension load in the bond between the first material and the second material by a timing combination of a reflected wave in the first material and a transmitted wave in the second material;
- and
- determining whether an inconsistency is present in the bond interface after transmitting the initial wave;
- wherein the initial wave comprises laser energy having a pulse width between about 5 nanosec to about 15 nanosec;
- wherein a compression wave is transmitted into the first surface of the first material and the compression wave is reflected from the bond interface as a tension wave to cause a rarefaction at the bond interface based on a difference between the first acoustic impedance and the second acoustic impedance;
- and
- wherein reflection of the tension wave at the bond interface builds very quickly and the first surface of the first material rebounds quickly creating the rarefaction and a pulling away from the adhesive and the second material.
Dependencies are inferred from the claim text.