Table 2 Contact state conditions.
Free state | Inner-layer contact | Outer-layer contact | Two-layer contact state |
|---|---|---|---|
\(g_{1} > 0\),\(g_{2} > 0\) | \(g_{1} \le 0\),\(g_{2} > 0\) | \(g_{1} > 0\),\(g_{2} \le 0\) | \(g_{1} \le 0\),\(g_{2} \le 0\) |
Free state | Inner-layer contact | Outer-layer contact | Two-layer contact state |
|---|---|---|---|
\(g_{1} > 0\),\(g_{2} > 0\) | \(g_{1} \le 0\),\(g_{2} > 0\) | \(g_{1} > 0\),\(g_{2} \le 0\) | \(g_{1} \le 0\),\(g_{2} \le 0\) |
