In simulations, fragments embedded in wounds should be realistic but lightweight, non-toxic, and without sharp edges.
Fragments are produced by explosions, terrorist weapons, and military munitions. In simulations, fragments embedded in wounds should be realistic but lightweight, non-toxic and without sharp edges. I use pieces of plastic plumbing connectors and nylon nuts and bolts as the basis for fragments. You can purchase these items at big box hardware and building supply stores. Cut into suitable sizes and shapes with a hacksaw. Sand away rough or sharp edges with 220 grit wet/dry sandpaper. A propane torch can be CAREFULLY used to melt and distort the pieces. I usually like to leave one side flat where it is attached to the skin. Finish with aluminum colour spray paint. Matte black paint will give the pieces a burnt look or use matte camouflage green for a military look. A reddish brown colour looks like rust.
You can use pieces of foam coffee cups and expanded polystyrene foam as fragments. Paint with an artist acrylic paint before spray painting or else the polystyrene will melt.
Adhere fragments to the skin using Pros-Aide adhesive. Apply a small amount of Pros-Aide to one edge of the fragment and allow to dry until tacky. Clean the skin with witch hazel and a cotton pad. Allow the skin to dry. Press the fragment onto the clean, dry skin. Add a bit of thick blood with a small makeup spatula; I prefer Fleet Street Blood Paste. This blood dries with a bit of a gloss which can be kept fresh with a thin coating of glycerin.
Use manufacturer recommended products to remove the adhesive and blood after the simulation. Fragments can be cleaned, stored and re-used.