# Why is Moment load in conjunction to Pressure and Gravity not solving for more than 10mins on 6 cores **URL:** \ **Category:** General Questions\ **Created:** [March 1, 2022, 11:36pm UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92 "2022-03-01T23:36:16Z")\ **Posts on this page:** 5\ **Page:** 2
**Author:** ![datsnl](https://avatars.discourse-cdn.com/v4/letter/d/8e7dd6/32.png) [@datsnl](https://prepomax.discourse.group/u/datsnl)\ **Post date:** [March 18, 2022, 11:31am UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92/21 "2022-03-18T11:31:56Z")
I am glad it worked out for you. ---
**Author:** ![Roger](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/roger/32/2472_2.png) [@Roger](https://prepomax.discourse.group/u/Roger)\ **Post date:** [February 5, 2024, 2:05am UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92/22 "2024-02-05T02:05:56Z")
I’m wondering if this `DCOUP3D` is working properly for bending moments. I get the expected values when applying forces, but unexpected results when applying moments. I’m using a simple test case with a cantilever beam. In PrePoMax I defined a node set (called Nodes\_face) and a reference point (called RP) where one moment around the y-axis is applied. You can see an screenshot below for reference: ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/6/6e284d88aef10c75657c1c20219d0aacef87ed1d.png) Then I define the connection between Nodes\_face and the reference point. To do so, I add the next CalculiX keywords: ```auto *Element, Type=DCOUP3D, Elset=RBE3 13804, 22915 ``` Where 13804 is the number of a new element and 22915 is the node number of the reference point for rotations. Then I define the distributing coupling as: ```auto *Distributing Coupling, Elset=RBE3 Nodes_face, 1 ``` Where I provide the node set (Nodes\_face) and a weight of 1 for all the nodes. I can see that the moment is applied in the right node and in the right direction: ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/f/f03f4c527b0bdb8d28e5fc6f1aa675f67880f813.png) However, when I run the calculation, I can observe that the cantilever beam rotates around the z-axis instead of the y-axis: ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/1/14beb96e22a8c6b30427a66c73bb6fc9696a2c79.png) Am I doing something wrong? Here you can find the file that I’m using in case you want to run it at your side: [Testing\_RB3\_for\_moments\_PrePoMax\_v202.pmx](https://prepomax.discourse.group/uploads/short-url/zx7KtqRf8XiQu3Syq4euDnIxKkx.pmx) (4.0 MB) Thanks for the support! ---
**Author:** ![synt](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/synt/32/4658_2.png) [@synt](https://prepomax.discourse.group/u/synt)\ **Post date:** [February 5, 2024, 6:45am UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92/23 "2024-02-05T06:45:13Z")
![2024-02-05 13_37_30-f03f4c527b0bdb8d28e5fc6f1aa675f67880f813.png (968×670)](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/9/97f3eee107fcc48eeffb7e4f3e8324dc0aa33c47.png) looking the input definition was set to force in Y(2) direction, not a moment. `DCOUP3D` element can not be used for moment type, required `Coupling` type `Distributing` instead. Below, an example used from another threads discussion. > [@RBE3 integration in PrepoMax (Kinematic & Distributing Coupling)](https://prepomax.discourse.group/t/rbe3-integration-in-prepomax-kinematic-distributing-coupling/44/14): > > i try to define \*Coupling type \*Distributing by the working flow of \*Rigid body available in PrePoMax. It found to be different in nodes number and DOF’s of Moment loads. \*\* Name: Moment-2 \*\*Cload \*\*3460, 2, 20000000 \*\* Name: Moment-2 \*Cload 3459, 5, 20000000 Another disadvantage is in visual presentation, symbol can not be shown. Even the results given clearly it was properly assigned hopefully … ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [February 5, 2024, 12:19pm UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92/24 "2024-02-05T12:19:41Z")
With the right type of coupling for this task: [Testing\_RB3\_for\_moments\_PrePoMax\_v202\_mod.pmx](https://prepomax.discourse.group/uploads/short-url/oDAztSSiUxRvSyc8Bc3KLd5DjVx.pmx) (1.6 MB) Abaqus also has both versions of coupling constraints and `*COUPLING` followed by `*DISTRIBUTING` is the recommended approach. This one is implemented in GUI. ---
**Author:** ![Roger](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/roger/32/2472_2.png) [@Roger](https://prepomax.discourse.group/u/Roger)\ **Post date:** [February 5, 2024, 6:53pm UTC](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92/25 "2024-02-05T18:53:57Z")
Thanks for the support! I confirm that the `*COUPLING` `*DISTRIBUTING` works as expected for forces and moments 🙂 I’ll only use the `DCOUP3D` approach to link a lumped mass (`*MASS`) to a given set of nodes as I’m not aware of other ways to do this without rigidifying the system. [Previous page](https://prepomax.discourse.group/t/why-is-moment-load-in-conjunction-to-pressure-and-gravity-not-solving-for-more-than-10mins-on-6-cores/92.md?page=1)