diff --git a/src/irrevolutions/models/__init__.py b/src/irrevolutions/models/__init__.py
index b756fa0..696a2a6 100644
--- a/src/irrevolutions/models/__init__.py
+++ b/src/irrevolutions/models/__init__.py
@@ -233,7 +233,7 @@ def elastic_energy_density(self, state):
             eps, alpha
         ) + self.elastic_foundation_density(u)
 
-    def stress(self, strain, alpha):
+    def stress_average(self, strain, alpha):
         from dolfinx.fem import assemble_scalar, form
         from numpy import ndarray