ng">double</span> <span class="string">=</span> <span class="string">double.empty</span>;   <span class="comment">% residual overlap</span>
    <span class="keyword">end</span>
</pre><h2 id="3">Constructor method</h2><pre class="codeinput">    methods
        <span class="keyword">function</span> this = ContactForceN_ElastoPlasticLinear()
            this = this@ContactForceN(ContactForceN.ELASTOPLASTIC_LINEAR);
            this = this.setDefaultProps();
        <span class="keyword">end</span>
    <span cl