```python
from ansys.dpf import core as dpf
from ansys.dpf.core import operators as ops

# Load the model
result_file = 'path/to/your/result/file'
model = dpf.Model(result_file)

# Get all node IDs in the model
mesh = model.metadata.meshed_region
nodes = mesh.nodes
node_ids = nodes.scoping.ids

# Find the minimum list of elements by node to get the volume check
elements_volume_op = ops.geometry.elements_volume()
elements_volume_op.inputs.mesh.connect(mesh)
elements_volume = elements_volume_op.outputs.fields_container()

# Create a workflow to compute equivalent stress averaged on elements
stress_op = ops.result.stress()
stress_op.inputs.mesh.connect(mesh)
stress_op.inputs.requested_location.connect(dpf.locations.nodal)
equivalent_stress = stress_op.get_output(0, dpf.types.fields_container)

# Apply dot product seqv.volume
seqv_volume_op = ops.math.dot_product()
seqv_volume_op.inputs.fieldA.connect(equivalent_stress)
seqv_volume_op.inputs.fieldB.connect(elements_volume)
seqv_volume = seqv_volume_op.outputs.field()

# Sum up those on the list of elements and divide this sum by the total volume on these elements
total_volume = elements_volume_op.outputs.field().data.sum()
stress_sum = seqv_volume.data.sum()
average_stress = stress_sum / total_volume

# Plot equivalent elemental stress and volume averaged elemental equivalent stress
import matplotlib.pyplot as plt

# Equivalent elemental stress
plt.figure(figsize=(10, 5))
plt.hist(equivalent_stress.data, bins=50, alpha=0.7, label='Equivalent Stress')
plt.xlabel('Stress')
plt.ylabel('Frequency')
plt.title('Equivalent Elemental Stress Distribution')
plt.legend()
plt.show()

# Volume averaged elemental equivalent stress
plt.figure(figsize=(10, 5))
plt.hist(seqv_volume.data, bins=50, alpha=0.7, color='r', label='Volume Averaged Stress')
plt.xlabel('Stress')
plt.ylabel('Frequency')
plt.title('Volume Averaged Elemental Stress Distribution')
plt.legend()
plt.show()

# Use the operator with the same algorithm that has been implemented
# Assuming the algorithm is encapsulated in a custom operator, here's a placeholder for its usage
# custom_op = CustomStressVolumeOperator()
# custom_op.inputs.model.connect(model)
# custom_result = custom_op.outputs.result()
```