Abstract: A stiffness matrix H? is designed as PiTCPi or a linear combination form thereof, where a spatial first-order difference operator, which operates on a state vector, of a displacement vector at each discrete grid point is Pi and the matrix of elastic constants is C. The mass matrix T? is derived using finite-difference approximations at the discrete grid points so that the result of the matrix ?Tnum operating on a state vector corresponding to rotations or translations is 0, where T is a positive definite diagonal mass matrix and ?Tnum=T??T.

Abstract: A stiffness matrix H? is designed as PiTCPi or a linear combination form thereof, where a spatial first-order difference operator, which operates on a state vector, of a displacement vector at each discrete grid point is Pi and the matrix of elastic constants is C. The mass matrix T? is derived using finite-difference approximations at the discrete grid points so that the result of the matrix 8Tnum operating on a state vector corresponding to rotations or translations is 0, where T is a positive definite diagonal mass matrix and ?Tnum=T??T.

Abstract: A repairable drawer or door assembly has a rear panel and a front panel that each have corresponding openings. Perimeter portions around the openings in the two panels are formed to capture a window. A removable escutcheon plate covers raw edges of the perimeter around the insert opening. The rear panel is fastened to the front panel to create an assembly that has no visible means of fastening on the exterior.

Abstract: An interlocking drawer or door assembly has a rear panel and a front panel that each have corresponding openings. Perimeter portions around the openings in the two panels are formed to capture an insert panel. An escutcheon plate covers raw edges of the perimeter around the insert opening. The rear panel is fastened to the front panel to create the assembly.

Abstract: An interlocking drawer or door assembly has a rear panel and a front panel. The rear panel is a five sided box, four low walls surrounding a face. One or more apertures are formed in two or more of the walls, and a plastic rivet or other deformable member is located in each of the apertures, such that the head of the rivet is on the outside of the wall. The front panel is a similar five sided box, with each of the four corners laser welded to form a smooth and hidden seam. Each of the front panel walls has an additional portion that is bent 180 degrees toward the inside of the box to form a rolled wall that is parallel to and in close proximity to the wall. Holes are formed in the rolled wall to correspond to the location of respective deformable members in the rear panel.